AC be gone

[rusty76]

First off I'm a new guy here. I've got an '76 Silverado that I've owned for many many years. I'm starting to work on it and do some fun stuff, but the one thing that I've had a time with is the AC. I don't care to keep it and since I've got the motor out I thought why not get rid of the AC stuff now. So here's the thing I need to keep the heater. If I remove the AC then what do I need to do. Can I use something from a non AC truck to make it work or will I need to go aftermarket or what? I'd like to keep it simple. Basically I need to keep the stock heater defroster still working, while getting rid of the AC. Any and all help will be greatly appreciated. Thanks.