Is anyone running Cooper Cobra Radial GTs, (or any other brand) Size P255/60 R15 on the rears?

I'm using 15 inch wheels for a period look.
The original 10.5 inch wide Goodyear bias ply from 1965 would equate to about 267/55 giving a sidewall of 5.78 inches (rim to tread)
Factory Five recommends 275/50, which have a sidewall of 5.41 inches (rim to tread) - just slightly under the original
The Cooper Cobra Radial GT, Size P255/60 R15 have a sidewall of 6.02 inches (rim to tread) - just over original
I think I like the look of more sidewall rather than less, even though it's a narrower tire than either the original or the recommended 275. Since they're narrower, I don't think the taller aspect ratio should cause any issues with rubbing, but I'd like to be sure.

The build is a MkIV Roadster and I'm planning to use the recommended size of 235/60 on the fronts.

Please let me know what you think, and please share pics if you have them.
Thanks!