Holley 4175 power valve?

Holley recommends single stage PV's for performance. I'd start with a 6.5 and go up 2 numbers on the jets.

Other 4175 oddities include the somewhat oddball float bowls which have no external float adjustment, and require the anti-pullover squirter nozzles. No big deals, but things to keep in mind.

If performance is the main goal, run a 3310 square bore and be done with it.