A Warner T10 will handle your 427. M22 Muncie is a good choice, too. Or a Turbo 400 auto, if you want an automatic. They're easier to find, and get beef-up kits for. The point about over-revving with a stick is a thing to consider. With a blower, there's gobs of bottom end, no real need for a high stall converter, so driveability doesn't suffer, and heat isn't such a problem. Of course, if it's a strip-only car, that doesn't mean much.