are there any 15" "junkyard wheels" that will fit an fbody to run a set of slicks on. i herad older 15" ralley wheels work. anybody know of any?

 

Usually the backspacing is way off. Just do a search on backspacing, you'll find the parameters you need. BTW I'm assuming you're talking about a 4th Gen. Backspacing will vary a lot based on year and personal tastes.