You bring up good points, making the needed adjustments to your system to accept r134a connections is a small aspect to the conversion, pulling an appropriate vacuum before recharging is important. Your comment about the current system being less than amazing w/ r12 will likely result is lower performance once running r134a. You may consider performing a bubble (soap/water mixture) test after adding r12 to the appropriate pressures. This might show where you could have a possible leak.
@pyroholtz My understanding is the two aren't compatible, nor is the oil used with. So my concern is purging, properly disposing of the old stuff, purging air out when I put the new in. I have done a lot of work but on cars, but never messed with AC ,(other than occasional recharge), so it is all sort of dark art mystery to me. I do have a seal convert to R134a kit, but the purging part is what I am a little fuzzy/apprehensive about DIYing. Also refilling from empty, assume I would have air in the system, have to get that out.
Lastly, the system for these cars is supposed to be marginal anyway and the R134a less efficient.
@k-roll-porschetamer that's great, I'm really happy to hear that! I hope things pan out and you get some interesting offers.
I'm doing very well. I'm actually in Bahrain at the moment for work. It's turning out to be a fun and interesting trip. And when I get back I am going to start transitioning to a new job! It's within the same organization, just a different position at a different office. It's a 2 year rotation, but I took it because I think in the long run the experience will be beneficial.