Choose your wheels and tires first. I can tell you what rear I have under mine, but since mine isn't tubbed and I'm not worried about wider tires, it really wouldn't help you.
I'm running the 10 bolt rear from under a '73 Chevelle wagon under mine. The width is 62 inches, which is very close to stock, and it works real well with 15x7 adn 15x8 wheels (I've run both) and 235/70-15 tires.
