360 magnum limitations

64 barracuda (the headers will be custom made)
727 with a 3000 stall converter, reverse manual valve body- have the stock 727 right now but it will be getting built to match the engine.
Rear end is a ford 8.8 31 spline 4:10 gear ratio limited slip

So maybe I should start with a 50hp shot? See how it does? Maybe on the dyno?

I will look into the scat rods and crank.

Luckily I know a good machinist that's very reasonable

Nicely thought out,guy. Set the tune without N20 first,learn the money you spent. Better machine work,careful assembly makes more return in investment, than anything else. You got it.
P.S: no N20 until you know how to actually know how to rebuild, tune,& and fully understand the 7 circuits of that carb.