5.7 in 65 Cuda w/tube axle

My buddy is a Chevy man and I haven't much exposure with the new hemi. My son has one in an '09 Magnum, and that's the sum of my history.

We got this engine and trans from one of my buddy's friends who told us it was from an '09. For the price we paid and the condition they "appeared" to be in since we could see the pistons, valves, etc., I didn't hesitate to buy it.

What I can't figure out is what kind of person spends a day or two polishing that trans but when they pulled it, if you look they snipped all the harness connections and then saved the now useless thing to sell with both. We were just baffled on that one but it wasn't a showstopper. Now I need a harness though so I definitely need to ID the block.

The body is in for bead blasting / POR the underside & compartment this week.....

As I've said, I'll probably be back with questions for the next month or so. We're looking at fabbing my Hedman's from the 273 to somehow work with this engine. They're like new and would continue the fenderwell exit. We hope to have it on the road by June.
Thanks for your help.