nothing wrong with using the original rear unless you're planning on mega horse power and lots of hole shots, the 56 was originally available with a V8 .... you'll be looking at some mount fabrication to install that combo, and of course rigging some type of shift setup .... you might determine the actual rear ratio and investigate the possibility of an overdrive automatic, like a 700R4 if you expect to see much highway time

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics