Before we go anywhere with this, why are you expectations? A frame "swap" is not simply unbolting and bolting in the new, it takes a LOT of modifications. If you think you are saving money over putting in a front end from the hot rod shops and a different rear end you are kidding yourself.
If you have never driven one of these trucks with a proper suspension you don't know if it will meet your expectations. They drive darn nice when things are rebuilt and working properly.