Brainstorming Ideas for 400-450 hp 360 Build

I've said several times you can make more HP with the open chamber head for the reasons MO mentions
especially you keep the revs above the torque peak
and
run extra special good gas
The traditional high compression big cam combination converter, gears etc

but you can make a better running street build with less sensitivity to timing and fuel with tight quench
remember this is a 4 speed build
no converter to keep the revs up and more likely to ping if lugged
build the tight quench motor
you do not want to always have to shift down when you would rather just give it some gas and go