Pulled the engine and tranny today. It came out pretty easy with the front clip removed. But as has been SOP with this truck, I've found more to fix as well as some things that have me guessing LOL.
Engine removed

Looks like the firewall got butchered up some. I don't think it's unusual to have to do some cutting to get the automatic to fit but the small round hole, above and to the right of the main cutout is perplexing.
Pic 1
The rear tranny cross member has some rust through that I can repair or replace depending upon how everything aligns with the SBC.
Pic
I do believe those shocks are going to have to be relocated to the outside of the frame rails. Course if I put some more leafs back in the shocks will have to be replaced.
PIc
The tranny's going to get pressure washed but I'm undecided on the TC. I believe it'll work on the 350 but don't know what kind of differences it may have from a SBC TC and if they'll be good or bad.
Pic
On the top of the TH350 is a short tube with a 90 degree bend and a dimple for acceptance of a rubber hose. IS this a vent? -or- if not what is it's purpose?
Pic

I'm seeing alot of needs on this truck but it's got a budget so full frame off isn't in the cards for it. At least not at this time.