15x10 Wheels Too Big?

I was wondering whether or not 15x10 Draglites would work on the rear of my 1990 LX. I have stock springs and shocks with some HPM Mega Bite Jrs. on right now, and will be putting 4 cylinder springs on the front shortly. I also have dumps, so tailpipe clearence isn't an issue. I am only running 15x7 rims on there now, and I don't want to roll the fender lip or anything like that. I was told the quad shocks will have to be ditched and that the wheels will only work with 6.5 inch backspacing? The Draglites will have a 275/50/15 tire on them. Let me know if you guys know anything that can help me decide what to do.
Thanks,

Thanks for the help

Thanks for some replys!
The wheels have that I may get have a 5.5 bs, so it is gonna stick out a little, I guess. I am gonna remove the quad shocks, so this should help from what I was told by some other people. I am gonna run a 275-50-15 BF Goodrich Drag Radial. Anyone have any pics of their 15x10 setup?