the whole system is out of the car, it did work but not to cold when i removed it.

i'm not sure if i need to replace any parts when switching to R134.

will other A-body parts fit?

what is that valve for on the low side between the evaporator and the compresor.

is there a proper procedure for installing the evaporator box that does not include removing the fender and cyl. head?

and I need to replace the heater core that recently sprung a leak.

MANY THANKS!!