I need more power, questions.

[dion]

So I have 2000 miles on my rebuilt, it's a 350 with .060 bore, Edelbrock Performer 600 carb and intake, RV Cam, mild performance everything pretty much, hydro valves, roller timing, forged pistons etc.. Dual Flowmasters with 2 1/4 pipes, crappy Headman headers. As it is the thing hauls ass, on the freeway I'm flying past most (safely though). When I jump on it it goes but I want more. My question is without going with a bigger engine what can I do? What about intake? Go to a Torker or air gap? My tranny is a TH350, go 400? What about rear end? I have a stock Dana60. Any thoughts would be great, thanks.