Raised white letter tires in back and blackwall tires in front, would it look ok

Was looking through old 70's car magazines and noticed a few cars back then had white letter tires in back but plain blackwall tires in front. I thought it look OK but back then just the brand name was on the tire and nothing else, so the lettering was just on 1/3 of the tire, not 50-60% now cause the name of the tire is added.

I want 255 70 15 tires in back for my old B body but all are mostly white letter and my fronts would be 215 70 15 which are in back right now.

Think it look OK ? sorry no pictures, looking at Cobra or M/T tires. Might go with 275 60 15 but its a little smaller overall and I want to cut my 3.91 ratio down from 4,000 rpm @ 75 mph which its at right now