So, I removed the radiator today and plan to take it a radiator shop for testing. I also checked my paperwork for the last thermostat, fan clutch and water pump replacement. Thermostat was done in 2015, water pump is over 20 years old and I could not find a receipt for the fan clutch. Since I'm planning to drive the car to Octoberfest in Pittsburg, I decided to replace the water pump and fan clutch "while I'm in there."
I've already run into some challenges and I'm hoping the E12 experts here can help.
1. The radiator was a big PITA to get out. Both the Haynes manual and BMW shop manual made it sound easy, but it didn't just "pull out" after the hoses, shroud and bracket were removed. I definitely messed up some fins on the radiator and AC condenser, hopefully nothing worse. For re-installation, could I unbolt the condenser and move it forward a little bit to get more room for the radiator? Any other hints?
2. Is the bolt circled in red on this picture the bottom bolt for the alternator? If so, is there also a nut behind it that I need to get to for loosening? I couldn't get a socket on that bold from above (PS pump pulley is in the way), so I'm guessing I need to get at it from the bottom, correct?

3. The allen-head bolts holding the clutch flange on the water pump are almost stripped and I could not get any of them loose with the amount of torque I thought safe. Short of making sure the allen socket is as good as possible, any other advice for breaking them loose without stripping the heads? Would it be safe to heat them with a torch?
4. Any opinions on a Beck-Arnley water pump? It's the only one I've found with a metal impeller.
5. Any suggestions for an aftermarket OEM quality fan clutch? I hope to not pay $270 for a BMW part, but am only finding aftermarket versions from companies that I don't consider OE quality (MTC, Hamburg-Technic).
Thanks for taking the time to read this long post. I appreciate all advice!
Thanks, Cory