I have a 1968 Camaro and the heater core is leaking yet again, 3rd time. I am wondering what if anything I should consider if getting away from the stock heater core and going to a aftermarket heating cooling system. It has been so hot here lately that AC is becoming a requirement. Anyone who has installed one please chime in and let me know how it went. Pitfalls, things you would do different and pros or cons of each system you have seen? I am currently at the point heater and box are out, two fenders off, and I am to the point to install new inner fenders and do the things I should (please tell me what you can think of I should also so at this point) from where I am now... Originally 1968 RS Camaro no AC ..thanks for some in put...