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I'm trying to get everything in order while im on crutches for the next three months.

I already have a set of 762 Castings with Big Stainless valves Fully Ported and Polished with Patriot Dual Golds. Cam i will be swapping to will be a TSP 226r or 228r with close to .600 lift and most likely a TBSS Intake manifold with a Polished/Ported 90mm Throttle body. Most likely install a 100 shot of juice as well.

Will OBX Ebay headers I have installed now have large enough primaries or should i look for bigger? I want to get the most out of this 5.3 and run it till it croaks then install a built 370.

Any help would be great.

peak HP vs average HP ? And at what price? When a 460 horse LS2 only gains 10 horses by switching from 1.75" to 1.875" primaries, and I'm not sure your combo is there even with spray, ( though I'm sure you at least hope it is ), then maybe you're not ready yet. In which case, you can be watchful for a really good deal, rather than spending a lot more just to have them right now. Because at present, swapping up might find you a few more peak HP, at the top of the tach, when using the spray, but your average power surely would suffer. Even with a re-tune.

Yah i know what you are saying. I got some feedback from other forums as well and i think im going to elminate the Y pipe on here and run trus 2.5" duals into dynomax race bullets dumped and see how that helps me. If not i can get a really good deal on a set of LPP long tubes with 3" collectors. Time will tell i have 3 months to get all my ducks in a row before im off my crutches and can install any of this.

Nope. Especially if you plan on a 370 later.