As I have stated my opinion in other threads on the AC topic: The only component worth saving when installing a Frigiking unit is the underdash vent assembly. That is if you want what most describe as the original (misnomer) look.
Then you still have all air supplied on the passenger side. Scrap the evaporator, blower, condenser, hoses, compressor, dryer and replace with new. Buds has a nice kit but the only components they source separately from kits available to retrofit in cars for an underdash installation, are the engine compressor mounting brackets and crank and water pump pulley. And I believe they sell the crank pulley separate from the kit. VintageAir is a good place to start to source parts.
I have familarized myself extensively with the dealer installed Frigiking AC system and am working on an integrated system that will supply air through the existing dash vents. This system will replace the existing heater core and blower (eliminates redundancy of having 2 blowers and will look and function more like a OEM designed system. One can argue what an OEM designed system would look like since that never happened but I thing everyone would agree it would not look like a Frigiking unit.