A/C evaporator conversion from old to new Freon

Having serviced a few A/Cs. I have to warn you to do a pressure test on it first. If the evaporator coil holds 135-165psi without leaks then replace the expansion valve and flush it out. (Remove valve and flush then install expansion valve) I pressure test with dry nitrogen.
The expansion valve and evaporator coil is where the pieces hide that destroy A/C compressors.
So also with the right expansion valve and a larger than original condenser you can get the same cooling from it as R12. (Those units didn’t cool to well anyway)
Also need to warn you. If your car was set up without A/C you will make engine cooling harder.