A500 in an Early A

65 Dartman said

Yes. As a matter of fact I have 2 more V8 steel cranks and one 65 slant crank and will get them all done at the same time

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That will work.
I'm not positive, but you might need to have a "ring" made to go over the flange for the flexplate, so can use the A-500 flexplate. I don't know if you can use the early flexplate with the 500 converter. The center hole in the 500 drive plate is larger then the flange on the crank.