Why not use the alternator off a '90 Corvette? Pretty much a direct bolt on replacement for a 10SI and puts out 100 amps at an idle. No need for for bracket change or idler pulley. For the plug there are adaptors or you could just re-pin.
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars
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