I hope I don't come off condescending here, but I DON'T GET IT! Why would you want to do all this work and go to all this expense with PF condensors and all sorts of dollars spent so that you can save $40 or $50 on refrigerant?

This sounds like the accounting methods used by the US Treasury Department!

You have already tested and found a leak free system. Add an ounce or two of mineral oil, evacuate thoroughly and recharge with R12. This will cost you a fraction of what all this work you're proposing and give you the system that was designed into the car with the refrigerant for which it was designed.

BTW, the evaporators in these cars do indeed have a reputation for failure, but don't buy into the notion that it is GUARANTEED to fail. My car is 21 years old with 310,000 miles with the original evaporator and NO leaks. It will make a Polar Bear scream for mercy and I live in Texas.