Hypothetical 475-500hp 360 build cost.....???

From what I have looked at and messed with LA engines, if you went swap meet with a bunch of parts, I could see a 360 like that for a little over $4k or less.

Keep in mind that a Mopar crate 360 that pushes 400hp is $10,300. They are nuts.

You could also hit up Summit racing and buy a Blueprint engines 408 stroker engine for about $4k. Just another option because keep in mind that when you are building an engine, the machine work is NOT CHEAP.