X2......Looks like it is locked up.Could be a bearing or the clutch in the ac pump
You'd likely wrap more money up in fixing that one than the $185.00 price tag of a new Sanden unit.

So what would need to be changed when converting to a sanden unit? I'm not worried about originality. Brackets? Wiring harness? and would I be able to run the sanden unit with R134a?If your not concerned about original I'd look into replacing it with a modern Sanden pump, a lot smaller, lighter, efficient and pretty inexpensive. You'd likely wrap more money up in fixing that one than the $185.00 price tag of a new Sanden unit. Just throwing it out there.
that sounds great! I'll have to check that out.No change in wiring needed.Check Classic Auto Air web. They have a kit that will get you Compressor,Dryer,Brackets and Hoses to the firewall with the correct fittings. Flush Evaporator,Condenser.Charge with R-134.That's if you want one stop shopping...