Originally Posted by frankinvett84
the engine going in is a carbed (for now) SBC .I would like to put the system back in as it is (I believe it just had a leak). I was just looking for some way to minimize the guess work and not waist cans of Freon when putting back together
You should be able to flush and check the evaporator and the condenser for leaks easily before you install the engine. I'd be inclined if I had all of the original parts to do the system again with R12. You need to determine what the leak was though.
The people that "hoarded" the stuff years ago have decided that maybe it wasn't such a great idea after all, it's out there and can be purchased pretty reasonably.