15x8 on a '67 Barracuda.

Hi, I have a 67 Barracuda and plan on drag racing it, this weekend. I can get some 15 x 8 with 4 5/8 backspacing rally wheels, sbp. I need to know if anyone has used these before with standard spring location? Will they fit with 235/60/15 M&H tyres. Being in Australia I'm a bit on my own when it comes to this sort of thing sometimes. The wheel supplier is unsure and my car is currently in the shop getting prepared, so I can't just go out and check it for myself. He is holding the wheels for me, but I'll need to sort it out fairly promptly I guess. I will appreciate any advice. Thanks.
Ooops, i accidentally already posted this thread in the classified section.....