Thanks guys. That info about the trunions was sort of what I expected from looking at it, but it might make the removal easier. Anybody ever remove one of these without taking out the radiator? Looks close but maybe possible. (Not that it'd necessarily be a good idea)
I got the numbers off the block. There's a serial number too. On that flat pad you mentioned, it's pretty obvious with the head off.

I'll try to pull the engine some time in the next few days, then worry about what to put back in. I do appreciate all the cautions and I agree. But it's sort of a case of either get the cheap engine and have a running forklift, with maybe a bit of extra work to do it, or wait a year or two since it isn't really a priority and then maybe just haul it off to the scrap yard instead of fixing it because it's in the way all the time. I'm sure you guys would rather see it fixed.

Jim