Newbie - 63 Dart GT

Hello. Been on B bodies only for along time, finally taking my first dive into an A body. My 63 Dart GT is a CA car, never left the state till now, even built in LA. Needs a heater core. Was bypassed when I bought it, was told because they didn't need a heater in CA. Well that wasn't correct, its leaking. What I've found so far is finding parts for these early A bodies isn't near as easy as a later B body. I'll be posting plenty as I look for parts and try to fix the few issues I have with the car.