Okay...called Classic Air/Original Air and it seems like the Stage 3 kit makes the most sense for my application.
Although my GTO is essentially numbers matching, I'm doing more of a restomod, so not absolutely necessary to rebuild original parts. At $550+ and shipping both ways for just the compressor, I think I may hang on to the OEM parts and get the kit. It won't look a whole lot different from factory and will take advantage of the weight/performance savings of a modern unit.
I don't think $1200 for the entire kit is outrageous...thoughts?
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1970 GTO (Granada Gold) - 400 / TH400