Hit the junkyard and get one out of an '05 Tahoe or similar truck model w/ the 140amp package. Direct bolt-in, no rear bracket, plugs into your existing harness, and no more worries about reliability.
Or just take your dead alt to a mom 'n pop automotive starter/alternator/generator shop for a teardown.
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1982 Z28 w/ '01 LS1 + T56, TR224 cam, Katech oil pump, JWIS chain
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