If you know how to do it, you can mount an external voltage regulator. found this on Rock Auto
http://www.rockauto.com/en/moreinfo....sn=423&jsn=423
78 Chevy 63 amps
here's an 89 Chevy http://www.rockauto.com/en/moreinfo....037135&jsn=529
Dime a dozen in the bone yards
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