Trying to bring the A/C back to life.

If your using R-134A, converting to a parallel flow condenser is a good idea. R-134A is not as efficient as R-12 in heat transfer and the old serpentine flow condenser can lead to higher discharge pressures at times.

There are universal parallel flow condensers available and you just need to find the biggest one that will fit in there. Also, having the radiator shroud and the factory A/C cooling fan in place will give you good air flow through the condenser. You will have to make up adaptors or new A/C hoses to match up to the new condenser.