Factory A/C in 1967-1972 Darts

slantsixdan said
Go here and pick out a true parallel-flow ("PF") condenser sized appropriately for the cutout in your radiator core support panel. Bigger is always better with a condenser; too big is not a thing.

Probably. Take a look at this exhaustive set of tests: R12 and R134a (and a few others not worth thinking about), with tube-and-fin (old type) and parallel-flow (new type) condensers, at a variety of in-car ambient temperatures. Take a look at the differences in vent temps and high side pressures with the old versus new type condenser, especially as demand rises (higher in-car ambient temp).

Wow... in all my time of working on the AC systems in Az temps I have never seen high side pressures like those with the factory system. My Coronet system will blow ice cold and I have never seen it over 220 PSI in all the testing I have done with it on the hottest days. I would warn this is a test that does not tell you how they maintained those input parameters and what the test setup was. It was also done by an auto AC sales company during the time when there was lot of R12 to R134 conversions going on... they wanted a reason to change out the condensers.... Just my 2 cents.