yep Nittos 275/50/17 went with that size because I had several people tell me that tire size would fit with out any mods. I cant imagine the 67 barracudas having that much of a different wheel tub.
Most 275’s are 11” wide at the section or even just under 11”. But those Nitto’s for some reason are 11.18”. So while most 275’s will fit without modifications, those Nitto 275/50/17’s will need a 1/2” spring offset to fit.
And you could take your rear axle to a welder and spend a lot less than $3k to have the perches moved in a 1/2”.
You don’t need a mini-tub though, the 1/2” spring offset should cover it with the right backspace
