I know this is an old thread but just thought I would update.
I left the GMC intact, was just too nice as is to modify. The 350 went into my 65 Nova SS and the Corvette parts got sold.
Fast forward 2 years and I have another truck, a 57 Chevy shortbox, and I'm building the chassis for that one. Bought the spare frame back from a buddy, picked up front and rear C4 suspension and started building my own mounts.
Picture of truck is a crude photochop to lower it to my intended ride height
