Wheels and Tires on the 65 Dart

Fabo members, Yes, I'm still working on the 65 Dart Revisited Restoration, and I need some help. Body work and paint, I'm OK, but with mechanics and suspension...I need help. I am installing a '72 340 block, 4bb, with 1968 internals, racer brown cam, forged crank, X heads, also, a 904 with a 3000 stall converter, an 8-3/4 SG with 3.23 gears, and LBP Nitro axles using drums in the rear with 1972 Plymouth discs in front, and my rear wheel openings will be untouched stock.....that is what I am working with. Now for the questions. I have not ordered or purchased my wheels/rims or tires, and in order to hook up reasonably, and have the room for the wheels and tires, and be appropriate for the engine, transmission, differential, and the space which the car has for wheels and tires. Can someone give me some recommendations on rear rim width, rim back spacing, rim size (14" or 15"), tire size, and etc? I do not know much regarding these questions, so I will appreciate your help/advice. Thanks. Old Dart 66.
I have 2 65 Darts and 15x6 are as big as you will fit with stock tubs. If you can adjust the back spacing, I have 2 brand new 15x7 and 2 brand new 15x8 OEM steel wheels. I paid Classics $112/each for and will give you a deal and ship them to you.