I've got a '54 Bel-Air and its supposed to use the 9.5" clutch. I use the 10" clutch for a '55 truck. As long as the spline count is right, and you have the flywheel resurfaced, you can use the 10". Or the 11" if it'll fit the flywheel. I would say to buy both kits, but each clutch disk/pressure plate/throwout bearing kit is 200 clams from NAPA.

hope this helps
chip


Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes