If the 15 x 8 with 4.5 BS is a zero offset wheel....then yes. We have used AR 15 x 8" with 4.5" back space to fit 275/60's and I've used a 15 x 7 with a -6mm offset with 255's. I'll try and post a couple of pics.
edit: the first pic is an old car of mine that a friend has now. It's got a stock rear, 15 x8 AR ansen spirnts that are 4.5" BS (0 mm offset). It has aluminum drums with no spacer, lip rolling or trimming what so ever. The tires are 275/60/15's. I have had this same combo with iron drums on an el camino...but it needed .200" spacers to clear the frame.
Bill