This is the starter. I bought it based on the recommendation of the guy who did the finish work on the GTO, and he installed it. In the notes it says "may need to be inverted", which I did yesterday, but am not entirely happy with (it only has one securing bolt instead of two - I can drill and tap a new securing bolt hole, and that's probably what I'll do).
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If I were doing it today, I'd have bought this one:
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It keeps the power and solenoid wire down low away from the exhaust manifold by default, and has lots of clocking positions available to get the starter in the right spot, and it's still way smaller than the typical GM big body starter.
In the meantime, I'm making the alternator post the "power post" for the harness instead of the starter, so I'm running a 4 gauge wire from the battery over to that, then the several power lines that feed the car and the EFI will run to the alternator instead of the starter post.