Good, sounds like your thinking about which way your going to go and what you'll need to look for.
We picked the rear end to line up, making that 5.5 no magic number. My Son had the motor in and out for 3 months every night, scratching his head. Then he made that cross member. If you like that one, check the rear mount he made for his truck:
rear crossmember,
installed we lucked out with our trans rear mount in the suburban it's out of a stock 92' Truck.
