I think my clutch was listed as a 10 1/2 inch, I wanted to replace with the original style, which is a Borg and Beck style, not a diaphragm style. I don't have a bit of trouble with it, had the original flywheel cleaned up at the machine shop. You should be good with a stock flywheel and matching clutch. Dito on the 400 flywheel, can't be used on the 350.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy