10 3/4" is what I think you have. It should be fine. Anything 10" or larger should be ok. Based on what I've been told by clutch guys (guys who do this for a living, that is), just stay clear of the 9" disk. Apparently they don't last long and have other problems. I'm going to be using an 11" disk, pressure plate and flywheel on the 1959 235 behind which I'll be running a T5 NWC (Astro Van) transmission, by the way.
Jon


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end