80 amp option was a FIXED position unit and Only came
With 2 configurations. AC + GRID rear defrost, OR AC and Power Windows. This has an Idler pulley set up. Way lots more than needed with today's tech.
Rear bracket. The 80 amp rear bracket IS DIFFERENT.
I have seen a few base birds ( 350 v8) from 70- 77 that when New, did Not have a rear bracket on the 37 amp alternators.
The Front Alternator bracket changed in 75 and the adjuster screw goes in from the front side of the alternator. This probably did move the support out further, but its close to in line with the pulley where the stress is.
You can easily run a rebuilt or new 10si, or 12si , 100 amp unit on these cars and rear bracket is common to 71 to 77, regardless of the front bracket being different.
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather
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