I agree it definitely appears to be a 36. Looks like a great project but judging from the rust on the deck lid, you'll probably find some in the floors and various other places. That's not meant to be discouraging, just stuff you'll have to repair.

Your plans for it sound great! I know you're probably a Chevy guy but don't rule out the possibility of powering it with a Ford engine....ok, maybe it's a little more work to do that but.....can ya tell I'm a Ford guy?? No doubt those LS engines are nice so I'll just shut up and be supportive whichever way you go.

For what it's worth, my family sold a '36 tudor humpback sedan in Texas about 3 years ago for $2500. It wasn't in a good a shape as this coupe.