I ve been told that the 68-75 cranks are better in terms of aftermarket parts availablity. Mainly a higher stall converter. I now have a 64 crank. Would it be worth it to find and use a later crank or are there lots of converter available for both?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Off-the-shelf converter selection is definitely much wider for the '68-up cranks with the large counterbore. Custom converters can be made with the small nose, but that's more costly. You can always just have your '64 crank's counterbore machined to the larger dimension, saving you from having to buy a different crank.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

If you go to a big pilot crank and converter, you also have to change the input shaft and pump in the trans.

But then, if you're gonna build a stroker, you'll want the big input in the trans anyway.

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Official Cookie and Mater Tormentor.

So there is enough meat in the crank to turn it? The larger input shaft is needed for the more common converters? Will this larger input shaft fit right in to a 1964 904A trans? If I decide to turn the crank and I still go back to the stock converter and smaller input shaft with a ring adaptor in the crank?
Whats involved in changing the input shaft besides finding one? I plan on having the trans freshened up. Is this something that should not cost anymore to have done if done at that time?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

What a custom converter cost?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Yes
Yes
I forget how far back into the trans you have to go in order to swap in the big input shaft. Might be some front pump components that need to be changed. The go-to guy for correct info is Pat Blais, tflitepatty@verizon.net
Yes, correct, Pat Blais can supply.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I've bought 2 custom built converters from Midwest, both for the large input stuff. The 10" 3500 stall was $300 and change, and the good 8" was a touch over $700. It is a trans barake/nitrous unit though.

One like you want would be closer to the $300 scale.

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Official Cookie and Mater Tormentor.

I am wondering if this getting and changing the input shaft would cost about the same as the custom converter.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

My experience with early cranks(somewhat limited) has been that they weigh way more than later cranks....I have a 65 crank that is 88lbs. It will just about stroke itself if spun fast enough. It never broke tho....

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Yeah....Im the one who destroyed this rare, vintage automobile.....

I likely need the bigger input shaft anyway. Forgot that even after just discussing it.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir