Gets hot and stalls out

OK folks, I think I might be closing in. I looked at the old alternator and the only numbers/identification i can find on it are:

USA
UV
INA
BCH 06604

The letters are the same on the new one, with the exception of an "X" instead of "UV".

The BCH 06604 is just the bearing, but everything I can find indicates that this is an alternator for a Chevy/GM vehicle made by Delco-Remy, likely rebuilt and sold by Powermaster. Unfortunately I haven't found an amps rating for it yet. I'm still looking for other marks on it to see if I can narrow it down, but that's what I have so far. I also noticed that the posts (ground and power) are in significantly different places on the two alternators: the posts on the old one are much closer together than on the new one. That would explain why I thought the ground was so close to the engine - because it was, relative to the old one.

Checked the wires too: the ground is a 10g wire connections are solid. It does touch the valve cover but there doesn't seem to be any heat damage to it. The battery wire is about an 8g; the 1/4" connector is kind of torqued around (from tightening the connection) but seems to be a solid connection.