you are forgetting one very important thing, you are talking about a brick aero wise you could add a overdrive to the trans because the 727torqueflight is only a 3spd
you folks sure get the nice trucks, all we can get here are land yachts, unfortunately the manufacturers have forgotten how to listen to their customers here in NA
your going to want a front axle from a ford because the engine is offset to the passenger side and the pumpkin is drivers side on the ford,also the rear axle could be a chrysler 9.25 which is stronger than a dana44
my dads 77 b200 had the 9.25