A/C Question? After Market System
Ok tech terms
The thing inside is the evaporator
The thing in front of the radiator is the condenser.
So you have the inside a/c stuff and the heater , Great .
When you get around the making the a/c work you will need to flush the evaporator of oil as the R 12 oil in it is not compatible with R 134a you will need to add the 134 type of oil to the system .
Under the hood change the condenser , dryer , hoses , and compressor to R 134a compatible components .
You can clean and reuse the expansion valve .
As for the compressor you can get a reman V2 for R134a or spend for new brackets and go with a Sanden which is more efficient and uses less H.P.
The R134 condenser is the manifold type . It has a manifold on each end . The freon flows across the condenser instead of the R12 type where it zig zags through the tubes .
The R134 hoses have a bearer lining in them because the R134 molecules are smaller than R12 .
Use the green o rings not the black
The dryer has a different desiccant the the R12 units
The use R134 oil only .
Adding a trinary switch will protect the compressor if there is a leak .
There are a few threads on the members restoration forum dealing with rebuilding the heater and a/c inside units .