SOLVED!....sort of. Where's there's spark.. there's no fire!

When I am forced into laughing hysterically I almost ---- my -----.

This is a decades-old fix in my book.

78 amps minus 3-amps field current = 75 amps. That's how Delco rates their alternators - cold. And the mod allows 5 to 8 additional amps at full output. No overheating. The 13 blade fan is early Delco 10DN.