I would try a bel air. I have pulled a 54 235 engine out of a 1946 chev truck that had already been converted like yours. It ended up it was pulled out of a car with a standard trans with the truck trans bolted to it. I have recently purchased a clutch and mine is 9.5 inches but they asked if it was 9.5 or 10.5 diameter.

Hope that helps.

Brent