15x8 Rear Wheel on a stock 65 Barracuda ??

I run 255/60/15 MTdrag radials on my 65Valiant
Wheels are 8x15 with 4,5"BS.
I had to cut the inner fender wheel lip so that the tire has enough space.
Rear is a modyfied 8 3/4 B-body axle housing narrowed to 52 5/8.
i think 245 ones are the better choice.