67 barracuda 275 60 15

That is what I have on my 68. 275x60 x15 Nitto Drag radials.

View attachment 1715685233

Yep, and you're a big reason I just sprung for the Nittos. From JEGS. I had been concerned that the 275/60's might a little taller than I wanted, but they look right on yours and, according to the published specs, they are only half an inch taller than the 255/60 M/T's. Plus the Nitto's have a V speed rating and are cheaper than the M/T's.

By the way, nice looking Barracuda you have there.