We used a 74' 4x4 short bed Chevy frame, you'll need to shorten a long bed. the 74' short bed wheelbase was 1" longer than the 51'Sub original frame, the axle width is where most 2wheeldrives find an issue. lifted springs is how we're sitting. Our plan included using a 6.0 liter engine, Dana 60 front and a corp 14 bolt rear. take a look at my {Progress}link for pic's, they should help give you an idea of what your up against.
