you should look for someone who is removing the factory a/c from their car. Make them an offer for everything. Get the lines, but have an a/c shop make new barrier hose lines.
Maybe your 76 had a/c and the PO removed it. You can use the existing wiring harness, otherwise you will have to run some wire to the front of the fuse block, back to the interior and back to the engine.
Jeff is selling his a/c out of a sc.
Here's the thread
911 SC complete AC system