I've seen P275/60/R15's, P295/50/R15 and a friend of mine had N50x15 bias ply tires on his 1968 Firebird back in the early to mid 1990's....I believe N50x15 equates to P315/50/R15 in a radial size. And yes you may have to jack up the rear end a bit.
Doug - is your car lowered any or any suspension mods?
I also run cragar superlite with 275/60/15 out back and 215/60 over the fronts. was thinking of running a 1" block in the rear.
It appears the name of the game is backspacing (offset). If you try to run 275/60/15s on say stock ralleys it might not work out.
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