To look “stock” keep the skinny tires, and you have 16” wheels which are a good tall choice, so keep them too.
I don’t believe white walls were, or look, “stock” so I’d stick with black.
You can use the old rims with radials, many have.

•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-