Hello I have a 86 Dodge Ram D100 3 speed overdrive stick shift with factory lean burn ignition and 1945 carburetor that my dad has owned for 5 year now the first year we got it had a crack in the factory aluminum intake manifold so we had it replaced with a cast iron manifold and had a new clutch put in it by one of my dads mechanic buddies went picked it up ran great my dads friend put some kind of fuel system cleaner in it and i drove it to school for a couple days and it slowly started acting up would stall out wouldn't want to stay running right acting like it was running out of gas so me and my dad replaced the fuel pump and filter still ran the same then had a re manufactured carb put on and unfortunately turned in the original carb in for the core charge. Since then we have put new cap, rotor, plugs, wires, checked over every vacuum hose on the truck, fixed all the suspect vac hoses replaced the alternator, battery tried two more remand carbs and five years later and it still misses the same and it doesn't miss on any particular cylinder it seems to miss randomly all over the place making a huff sound out the tailpipe every time it misses. My dad got so tired of it he gave me the truck and iv been messing with it for a month and have figured nothing out so far i have gone over looking for vacuum leaks again found none replaced a bad pcv valve truck ran a little better but no change to the miss just a little less stumbly so I dont know what to do anymore between my dad and me we have gone over everything we can think of and any help would be greatly appreciated thank you.

Your problems are likely caused by the lean burn system and the remanufactured carburetors you have been using.

Step one, remove the lean burn system. Replace the ignition system with an HEI system. Instructions on how to do the HEI swap are HERE.

Step two, replace the carburetor with a non-computer compatible carburetor. You need to get a non-lean-burn carburetor because the lean burn carburetors more often than not do not have the correct port for a vacuum advance distributor. I encourage you to find a useable condition original carburetor and not a remanufactured carburetor. That is getting hard to do these days, though. Try and find a pre-1980 Holley 1945 or 1920 carburetor, and try and find one that has all the hose fittings your current carburetor has to adapt it to the emissions systems on your truck.

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Casually looking for a Clifford hyperpak intake for cheap.

Does anyone know how I will hook up the vacuum system after removing the lean burn and switching to a 1920????

Do you have an underhood diagram for the existing spaghetti? You will need the ported outlet for your vacuum advance for the distributor (port above the throttle plate) - that should be one hose going from the above throttle port directly to the distributoor and you will need a port below the throttle plate for the charcoal canister(s). Make sure the evaporative fuel system doesn't have leaks like a cracked charcoal canister or such. The PCV will be obvious - it's the big one. the last one is another below the throttle port for hooking up to the air cleaner thermostatically controlled flapper valve. That goes from the port below the throttle plate to the thermal sensor then up to the flapper valve. I'm sure I've missed something. Extra ports should be plugged. Mark stuff now before your start removing things.

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Tom
'86 Alfa Romeo Spider, red "Dinsdale"
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'82 Dodge W150 Power Ram, yellow "E. Valdez"

You will hook the vacuum from the distributor to the correct port on the Holley 1920. If you don't know what port that is, you need to do more research. See HERE.

The 1986 carburetor most likely does not have a port that will work correctly with a distributor vacuum advance. The lean burn carburetor more often than not had no "ported" or "timed" vacuum tap for use with a distributor vacuum advance. Instead, the ports on the carburetor were all full manifold vacuum all the time, exactly what you don't want for a non-lean burn distributor.

Realistically, there is no easy way to use a lean-burn carb with a non-lean burn ignition system and have the vacuum advance work properly.

The caveat is there were some lean-burn carburetors built in the 80s that DID have the correct vacuum port for a distributor vacuum advance. But they are not common.

Given the rapidly dwindling supply of decent carburetors, your best bet these days is to find a good carburetor (holley 1920, 1945, or Carter BBS) that will fit on your engine and hook up as many hoses to it as you make work properly. The only absolutely critical hose fittings are the distributor vacuum advance and the PCV port. All the rest are useful and desirable (hated air intake fitting, charcoal canister fittings, EGR valve fittings) but are not critical to making the engine run.

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Casually looking for a Clifford hyperpak intake for cheap.