Regarding a rebuilding shop "hopping up" an alternator
No rebuilding shop rewinds their own alternators
Therefore they have to rely on what their supplier offers
Replacement stators use laminations that have had the old wire burned out of them
Nothing is free in the alternator hopping up department
Change a WYE WOUND revised 78 amp squareback stator to a DELTA WOUND
And top end output may jump from 78 to 110 amperes
And midrange maximum may drop from 50 to 30 amps
While at alternator speeds of 3,000 and below there will be zero output
And it helps to keep in mind with alternators of 90 amps or greater double 15/32" belts or greater must be used. There exists no serpentine belt pulley.
See if you can find a 4091460 117 amp alternator, and brackets at a wrecking yard. At lower speeds this alternator may develop 85 amperes while a revised squareback sruggles to make 20 amperes. The 4091460 is a tough unit.
