Installing a/c help!

Any 12V electric compressor would draw one HECK of a lot of current under load, I'd guess 50A or even more. You'd be much better off even if you have to BUILD custom AC pump mount for your engine.

But since Mopar used V belt compressors up into the 80's on various cars and pickups, I would not think it that tough to get a setup from a junkyard off a 318/ 360