2/13/19: Today I noticed the alternator is not aligned properly with the water pump and the balancing damper pulley. The existing generator bracket (mount to the engine) was utilized to mount the alternator by using a threaded rod and a few more nuts. The rod is too small and is bending under the strain of the tightened belt. In addition, the bracket to tighten the alternator was too short and extended by adding 2 additional pieces to the bracket to extend it.  The existing generator bracket looks like it could be modified to make a proper mount for the alternator. This could be accomplished by cutting the right side mount and welding it back in the proper position. I think the only solution for the tensioning bracket is to replace it.
Another solution is to buy a prefabricated mount and belt tightening bracket especially made just for this conversion. This kit sells for about $60. This sounds like the way to go.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum