You know what, once you get your 2bbl on there and set it up you may find you can advance it as far as you need to without pinging. Whole different carburetion system. I would guess your old one is running lean.

You may not need the EGR at all to lower chamber temp. If the mixture's more enriched the temperature will go down.

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

I know I need the vacuum amplifier, but I thought the switch only came into play for cold weather driving. I'm not familiar with the inhibit switch, and I don't think it's on the Aspen setup...at least I can't find it.

One problem I do have is I already discarded the old EGR valve and according to NAPA, the Echlin catalog shows 6 different part numbers for the 225. The number needed depends on the OEM part number, so I might be screwed without knowing that number.

One thing that's worth noting is that an EGR setup will normally close the valve completely at wide open throttle anyway. If the system is working correctly, it should not affect performance either way. (This does not apply to some of the early full-time systems that used a metering orifice instead of a valve, then again, that's not a system that can ever be said to be working correctly.)

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

Depends on your definition of "performance". Most of us don't spend much time at WOT so "performance" means on-road driveability at various degrees of part throttle.

Not all of the \6 distributors are the same internally. The old adage of bumping the distributor to 10* BTDC may not work for you. I recently took my distributor apart. It was from a '78 Aspen with the SuperSix package. I could never advance the initial timing more then 4* BTDC with out pinging. The reason was the the distributor was designed to have 26* of total advance. The vaccum pod had 22* of advance. The stock \6 can only handle about 30* total static advance.

Following previous messages from Slant Ceciel and DusterIdiot and doing some spare parts engineering, I built a distributor to only have 18* total advance. With 12* BTDC inital, I have 30* total static. The vaccum pod was also changed to give 11* of advance. I still have pinging if I push the car too hard. Some additional fiddling is still obviously reqired.

Did I get amasing amounts of power and torque. No, not really, but the car now runs down the road much easier.