Inputs on a home built 318 for red light to red light fun
I skimmed through this, the OP wants a 7500-8000 rpm 318 with 1.88 360 heads ?
At best with stock heads will squeak out 350-375 hp which ain't bad but you'll only need to turn 5400-5800 rpm to hit those numbers. Cam heads plus intake/exhaust etc... Has to be capable together and match with the rest of the combo to hit those rpm and make power, just a cam that's says 4000-8000 rpm on the box isn't gonna do it.
Build a solid combo and turns what turns and makes what it makes people get to caught up in numbers. 5400-5800 is a decent amount of rpm and can make good power there especially with large displacements.