$12 less at Rockauto.
( search by 7024N PN )
Amazing, they were going on $50 rate quite ago ( remanufactured )
kept searching at Rockauto and found:
PURE ENERGY 7546 $27.89
ACDELCO 3341006 $45.99
REMY 14256 $46.89
Everyone same 78 amps alt, remanufactured, but serpentine belt pulley. Is just about change the pulley and done.
( searched on 86 Charger turbo list )
I bet searching down some other models will get the same
So if we think on the BEST BANG OF THE BUCK as requested... IMHO this is the winner.
EDITING... all these alts are A HAIR WIDER than the stock due the wider stator ( reason why they put more output ). This could be a problem on BBs, but getting a longer belt ( just 1" or 2", can't recall ) is enough to sway the rear of alt from block, and trim a bit the rear spacer to keep the best belt aligment will make the job.
Being there done that