Finally got a rig

[kcabbie]

Drove past this truck yesterday morning on the way to work. I made a u-turn and snatched it up quick. Has a granny 4 speed and a 5.7 that was just rebuilt. Runs great, '82 model, no smoke or leaks. Strong truck. It orginally came with a 7.6 or something.. I can't remember exactly. I just know it was a HUGE engine, and was gasoline. I thinkg a 468?

Anyways, it has a/c in the cab(vents and controls) but no compressor on the engine. There is a bracket on the top right for a compressor, and has everything else aside from the two lines that go to and from the A/c. The blower works on the ac and I just want to double check that i can use any compressor of any 5.0 or 5.7 etc.

Sadly, this is my first sbc. So I lack many of the things that I should already know. I plan on putting a 5 speed out of a newer truck along with possibly a 3.73 rear end.(has 4.10)
Thanks for any advice

Kasey