~450hp from stock stroke 340?

Yup, that’s why I think I will be able to get there with this combo. Definitely am thinking about getting bigger cam than what I initially suggested, I think 750 Holley (whether that be a DP or street demon) carb with a couple of adjustments should be able to handle whatever cam I plan to throw at it.
Bigger cam definitely get you 450 + hp, the one you pick probably get you 450 hp maybe come up a little short especially if cr is a little wanting.