15x8 Rallye Rims - will they fit ??

Is anyone running 15x8 Rallyes with 4.5 backspacing on a Dart Sport ?
Will they clear the leaf spings in the stock position ?
What is the biggest tire that would work without rubbing ?

I've been offered an nice new set tonight and want to make sure they'll work.

Thanks !!!!!!

(I can go out and measure but it's late and I don't feel like pulling the wheels off if someone can answer it for me :prayer:)