Hooked up the manifold to the AC system today and checked pressures and air temps inside the car. The compressor was clicking on and off when I cranked up the engine. I purged the lines and then started feeding a little bit of refrigerant at a time into the system as I monitored things. Pressures looked pretty good and the air temp was in the high 40s, but honestly, I didn't add very much refrigerant at all. The can still felt like most of the coolant was still in it based on weight. But I certainly didn't want to overfill it.
After the engine cooled down for several hours, I went back out into the garage and started the car up, and didn't get any of the light cycling that I would often get on the AC button. I'll try again tomorrow after the engine has cooled down overnight.
Alternator seems to be working just fine and getting a solid 14 volts to the battery at idle.
Might not get to do a test drive until the weekend, though.