The 4 speed tranny is original to the truck, the 235 engine is not. Clutch disc measured 9 and 1/8 inches when I took it out. Jim Carter catalog says normally would find a 10 inch disc with a 4 speed. What size disc and pressure plate should I go with if I replace both?

1951 Chevy 3100 5 window with a 1958-60 235 and original 4 speed.