I think original wheels are close to 5" wide? And are quite close to tie rod.
So these wheels might be about 4" more hanging out than stock on each side.
With too big a tire they might chew on the rear of the fender opening, particularly in a bump while turning.

•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-