That's what I was looking for....I just wanted to know if I needed to replace the receiver/dryer and the evaporator.
I have seen where others tell the owner to not mess with the evaporator unless it is leaking....but I figure I am that far in and knowing my luck I will button everything up from the heater core install and a month later I will be needing to pull it all apart because the evaporator started leaking.....That logic just did not make much sense.

So replace the pieces that you mentioned, take her to an A/C shop and have em pull a vacuum so we can test if any lines are leaking.

Also, I have seen mentioned that people switching to R134 (they say the right way to do it) should go through and completely change their components, and I am guessing seals and hoses as well (I am not sure cannot find the posts I found).

Would this include a new compressor?

Do they make parts that are for use with R134 and replacing these would make the system better, cooler, or more efficient.

I do not mind using R12 and I am planning to go through whatever hoops I have to so I can buy the stuff....but I would rather have all my vehicles R134 so I can service them and not have to purchase a recovery machine for both refrigerants. I have a 65 Beetle that I would like to have A/C in, a 65 and 66 Mustang that are definitely getting A/C, a Jeep CJ-7 that is definitely getting A/C, and my Wife's new Saturn Vue that I would like to be able to work on....So getting a machine, training, and one type of refrigerant would make things so simple.