Brainstorming Ideas for 400-450 hp 360 Build

Stroke to 408. easy 450 hp with trick flow head or edlebrock and much milder cam than a 360.
No matter what head you use on the 360, it's gonna take a radical cam to achieve 425 hp the midrange of your goal.
A 450 hp 360 will not have good street manors.
Spend your money wisely once. build a 408.
I would agree with this comment, however I made nearly 430hp with small valve, iron "J" heads and a relatively mild hydraulic cam. If I had gone a bit more aggressive versus conservative on my cam choice, it would have made a better number. There was allot left on the table but still a very respectable, reliable daily driver number.

Heads is absolutely the key in these engines but my example shows you can make well over 400hp on a budget.