Sourcing R12 240sx compressor

[Tim]

Without also swapping the serpentine style condenser for a parallel flow, i would be sacrificing quite a bit of capacity and efficiency from what I’ve read.

Not necessarily.

For what it's worth, until recently, I owned a 1994 Toyota Camry V6 Wagon, bought new, with a factory R-134a system (first year for any Toyota, from what I understand) that had a serpentine condenser and a R/D with a sight glass. This car regularly recorded center vent temperatures in the high 30's, even on 95-degree days in the humid South.

Impressive, but I imagine is was sized accordingly!

It's not about the type of condenser, is it removing the heat load? Heck, you can use an original tube & fin if the heat load is being removed.