Wheels for a 69 Swinger 340 wanted

I have a 69 Swinger 340 with the 4" bolt circle on the front (disc brakes) and the 4.5" bolt circle on the rear (8 3/4 rear). I want to put on some nice rims and beefy tires, I'd like Magnums but 5 spoke Cragars will do. It looks to me like 275 60 15's would fit in the back but I'm looking for options. Thanks in advance, Dave.