i should've added the caveat that i run my cars quite a bit lower than most. at or near stock ride height changes a lot of variables.
on the 15X7 with 3.3 BS, with the 205 and it being barracuda you will probably be okay. but i know it'll be tight.
i know it's not apples to apples, but i have a 65 dart with 73+ stuff and 15X6 with the 3.5BS (the same as earlier mentioned) and while it's got 205's on it, they're "cheater" 205's and it is very close with the ride height i have.