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Your plan is way out in left field so to speak, and no knocks against you.
If I went to a Prius web site and said I wanted to put a Chevy 350 SB in it what sort of reaction do you think I would get?
You want help, ideas? O/k, my and most here would tell you a mild small block with a good ignition system and a Q-Jet carb, along with something like a 3.08 rear will get you very decent mileage. If you bought a Corvette because you wanted a Vette and the experience, putting in a Toyota 6 cyl. (and an expensive project) would defeat the idea of having a Corvette.