What should I expect from 450hp?

Drive those different combos you mention.
Real world

Not exactly I went with an achievable 1.23 ish lbs-ft per cid. The dyno for a crate 380hp/360 makes 440 lbs-ft, just looked at a couple of 318 builds were doing 385-405 lbs-ft A 340 411 lbs-ft, lot of 408 don't even hit 500 lbs-ft some do better, nothing out of the realm of possibility, if they made 3.66 and 3..88 gears all three of those would come out the same.

Just was showing the gear has just as much as the stroke when it comes to power to the tire.