In my opinion, if you have all the parts, you should refurbish the original. Here are some reasons why I say that (again, just my opinions):
- You maintain the car's originality. An original A/C car is cool (pun intended).
- The original system was engineered for your car - you know it will work and fit well.
- You avoid having to buy all the parts and custom install an aftermarket system.
- I think it will likely be more expensive to buy a whole new A/C system than to refurbish the old parts.
If the compressor is an issue, then you can buy just a newer style compressor rather than refurbish the huge unit Chrysler used, although, again, I think it is cool that you still have A/C on the car - use the original if you can. My 73 340 Road Runner is an original A/C car, and I maintained the original system. The A/C works great in it.
By the way, my 70 Air Grabber Road Runner did NOT come with A/C, and I custom fit a Classic Air system and hid the installation as much as possible. This worked better for that car because (a) the car never had A/C and (b) I wanted to hide the compressor. This is a nice system too, so I think either way you go, if installed properly, will work well.
Hope this helps, and I am sure others will chime in too.
Hawk