Any part numbers you get for the pressure plate and disc wold be a guess, better pull it out and see what you have for sure. No telling what clutch someone put in it over the years.

Ideally you would have an 11" clutch, (might actually measure 10.75") The pressure plate for that size clutch is held on with 9 bolts.
Clutch disc should have 1.125" 10 splines if I remember correctly.

Again, best bet is to pull your old stuff out and likely have them rebuilt, or at lest know for sure what you need to find.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-