Drag Radials on a 67 barracuda notchback

Seem to be alot of guys running 275's on cudas with no mods....thats awesome. I have been thinking about going up..I am running 255/60/15 and my tire jounces just fine into the wheel tub.

John, could you post a few more pics of clearance? How tight is it on the upper/outer part of the fender?