I've got 275/60/15s on my 68 sedan with nothing more than a 1/2 spring offset. I'd think 255s could fit with everything stock. You just have to get the backspacing on the rims dead on.
Same here..15 by 8", 4.5 back spacing..Be careful,on tire choices. All tire manufacturing companies,are quite different in "sizing" I have 275-60 -15" BFG. Drag radials. Measure &see a physical set,before you buy a damned thing..(My opine...)
