It sounds like you have the wrong belt for the fan on the panel (too short). Shimming up the engine will change your driveline angles, not good.
After you do the V8 belts 30 or 40 times, you get the system down pat.
1952 F-1 Flat V8 3-on-the-tree MSD, Rochester 2G, Red's Headers
"Never attribute to malice that which is adequately explained by stupidity" -- Hanlon's Razor