I went through this process last week, but on a 124 chassis. After some debate, I decided to skip the parallel flow conversion. The sole reason was laziness on my part - I didn't want to deal with the extra work to mount the condenser and have hoses fabricated. In the end, the cost probably would have been about the same. The PF condenser is about a hundred bucks less expensive than the OEM replacement. That should be plenty to cover the custom hose fabrication. But you're looking at a couple of hours to fabricate mounts for the condenser and fans, take the whole setup to have hoses fabricated, etc.

If your car has dual electric fans on the condenser, I don't think there would be much benefit to converting. Those fans move a lot of air; even the OEM serpentine condenser works OK with that kind of airflow.

Unless you live somewhere crazy hot, reverse converting to R-12 and using the OEM condenser should give adequate performance. If it's not cool enough, consider tinting the windows darker

- JimY