Don't mind the body mount, the will fix later in time, but not high on my list.
A convertion is pretty easy everything is a bolt up process, the truck was halfway done when i got it, but the rear hanger are already in the frame i belive so all you need is
CRoss member, with motor mount brackets, or customs fab if up, you can use the 2wd and makes a plate from the frame to bracket and bracket to bracket. I tried just welding frame to bracket each side the weld broke, tig welded.
Tranny/ t-case
springs
Axle
Shocks
And drivelines.
the front and rear
Yes the exhast is welded right there, a muffler shop did it, don't know why but they did, And i don't really care.
Edit i was going to take a pic of a 67-72 chevy truck that was at the dunes, a nice one clean from where i was at, but seemed the motor was lackng somewhat sounded good, just tires didn't seem to want to move fast, He was trying to throw sand.