Newbie here starting my 1st A body and need a/c help

The original system is so simple and straight forward, why would you even consider reengineering it? If your car is anything even remotely along the lines of a "restoration" the aftermarket A/C stuff is going to stand out like a sore thumb.
Stick with what Ma Mopar put in there, and just freshen everything up. You'll be happier and the car worth more in the long run.