Firechickenracin

hello i have a 69 firebird and am looking for bigger tires. its got new rear springs and there stiff as hell so i wanna fill up the wells! right now i have 265/50/14's on there and they are way to short to even get near filling the wheel well there is a good 2-3 inch gap from the top of the tire to the fender. now i want to get some 15x8's on the back with a set of 275/60/15 BFG DR's will that fit on my car? thanks to all who reply
Steve