Millers Classic Pistonease 20/50 mineral oil for the engine, from Opie Oils:
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I use AC Delco filters PF1218. I expect Scott at Corvette Kingdom has these.
Gearbox will need Dexron II fluid. I currently have Castrol Dex II in mine, again bought from Opie.
Opie will deliver, often free and, you get a club discount.