I do not use the “double stud”. It would alter the angle of that rear alternator bracket even more. I’m sure I have one in the various boxes of bolts I have, if you need it.

Re pulleies, I replaced my water pump pulley with one that is a smaller diameter to get more water flow. Seems to have helped. I also had to use a spacer behind it...made a jig on my table saw to cut an aluminum spacer to the proper length. Came out perfectly. Since I also use a spacer on the other side, I super glued the both spacers to the pulley to make installation easier. Got some grade 8 bolts of the proper length, and all is well. It works so well that, even though I have since found the “correct” pulley for this application, I see no need to replace it.