I'm posting this with the best intentions, and not trying to sound like an ass, FYI.
Man, if you're going for highest hp then go for it, who am I to tell you how to build or brag about your car. BUT, the way you're going about this is kind of "blow hard-ish" if you don't mind me saying.
With that size cam on that LSA, you're looking at needing to run a fairly sizeable stall, which eats up power, thus hurting your chances of being the "dyno king". Now if you go no stall or small stall, all you're going to have are "dyno king" numbers, because the car's going to be a dog off the line, and you're going to get a first hand look/feel of CAM LAG with a donkey dick bumpstick like the one you want.
As for the heads, as Andy@Livernois stated already, GM did a fantastic job of R&D on the L92 head, and it's hard to improve on it as is. CNC'ing is a good option, but I don't think you're going to be getting the 30+hp over a standard worked over (valve job, maybe milled) unported set of L92s.
Another thing, I see gears in your sig as another future mod.....also another thing that eats into your planned "dyno king" numbers.
If you are dead set on having the highest hp number that's fine, but keep in mind it'll be the highest @ PEAK, that doesn't mean that it'll be the most powerfull under the curve where races are won/lost. A properly setup combo with plenty of power from 2500-redline will hand a peak hp setup'd car it's ass on a 'strip. Having a high or highest dyno #s DOESN'T automatically translate into low ET/high MPH in the 1/4.
That's why all the MS4 cammed LS1 fbodies that get romped on by a Torquer 2 cammed LS1, they ask "How'd you beat me, I got a WAY bigger cam and better dyno #?" I speak from experience!