Replace ALL the actuators while you are there. It think there are 6-8 of them, total. Believe me, you don't want to do this again!
Buy the evaporator with the copper lines. They last longer. Change the expansion valve and the receiver/dryer also. As far as the R12 or r134. You will find different views on that point. Personally, I changed mine to r134. No problems so far. It has been a couple of years since. Bottom line, it is YOUR choice.
Good luck!
