More progress...
Donor engine is out, intake is off to powder coat, Holley Terminator engine harness had one sub-harness that wasn't correct for the car but that got ordered today after the Barracuda was dropped off. Correct dipstick for the new pan as well as Holley exhaust manifolds also ordered. Transmission guy happened to be at the shop and we discussed the 46RE. He's starting on it tomorrow. Last major part to order is a radiator. Leaning towards Cold Case with shroud/fans but I need to do some measuring on the car since the CC website isn't super clear on exactly how/what their rads fit and I can't recall which side the hoses are on the donor engine or their sizes.

RE: the 46RE...last year I found a thread (possibly a different forum) showing where a couple ribs/nubs etc. needed to be trimmed off the trans case for clearance. Can't seem to find those images now. Any guidance appreciated.