What should I expect from 450hp?

sorry, not true. There is basically no difference between a 3.23 and 3.55 gear. Very little. Barely noticable
There is a big difference between a 3.58 and 4inch stroker crank. Real big. Very noticable

it's not quite that simple...I remember a comparison Dulcich did with an identically built 408 and 360.Can't remember exactly but i think they used a stout cam and stock heads.There was very little difference between the 2 engines.