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I like the delco 10si. You want one with the terminals at the 12:00 or 3:00 position. (You can unbolt the back of the alternator and rotate it to move the terminal to a different position. As for which one to order, I lifted this off of another web site:
10SI, 63 amp, at 3:00 (AC-DELCO # 321-39, Lester #7127-3)
Tell the auto parts counter person that “The alternator is for a 1978, Chevy Camaro, 8cylinder 350engine, with air conditioning.”
10SI, 63 amp, at 9:00 (AC-DELCO # 321-41, Lester #7127-9)
Tell the auto parts counter person that “The alternator is for a 1979 Buick Regal, 8 cylinder 4.9L (301W) engine, with air conditioning.”
10SI, 63 amp, at 12:00 (AC-DELCO # 321-43, Lester #7127-12)
Tell the auto parts counter person that “The alternator is for a 1977 Pontiac Grand Prix, 8cylinder 5.7L (350R) engine, with air conditioning and with H.B.L.” (H.B.L. = Heated Back Light–meaning rear window defroster)
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