Quick tire and rim question

[Dano4163]

I'm in the process of restoring and doing a little custom work on a 1969 GMC C1500 1/2 ton 2wd. I ran across a good deal on a set of 15" fanjet style aluminum rims. Stock rims on this truck are I believe either 6" or 7" wide. The rims I'm looking at are 9 1/4" wide from outside to outside. What I'm asking is can I use these rims with a set of P235 75R 15s, will it clear everything and not rub when I cut the wheels? I am also converting it to disc brakes and I want to keep the suspension stock. I can't put them on and try them because I still have the front-end out of the truck and I don't have the tires yet. Thanks in advance for any input.