A/C Conversion Advice

[coop34]

I'm torn on whether to give up on my non a/c to a/c conversion or just bite the bullet and go with an aftermarket a/c kit (VA, Old Air, etc.)

I have a non a/c cab and purchased an a/c system on craigslist from a 70 chevy. (A/C box, condenser, old compressor, actuators, most of the brackets, etc.) I started the non a/c to a/c conversion by modifying the firewall and installing the a/c box with a new evaporator. The system I bought didn't come with the poa valve, and now I'm torn on how to finish this up. Do I go with a poa eliminator setup? Accumulator and orifice tube setup? Is it worth seeing if the old A6 compressor will work? Or should I go with a newer one? Any advice/help would be greatly appreciated!