When I did my '63 back in the late 70's, I removed the front clip, removed the bed, then jacked the whole thing up, built an A-Frame through the open windows, and used a cheater pipe on a breaker bar and a lot of WD-40 to break my cab bolts free.
Then I just swapped out the tires for 4 stock rims with no tires, lowered it down and rolled it out from under the cab.
I had backed into a telephone pole at 35mph after hydroplaning during a rainstorm. Bent the frame and had to replace it. :-(
When I was done swapping the drive train over, I just rolled that back under the cab, jacked it up, and bolted it together.
It's amazing how much easier it is to work on the drive train with no sheet metal on the truck. :-)
