I recently installed edlebrock 6037s, other engine related mods are shortys, xpipe, flows, 255 in tank. My car pulls really strong from 3000-4500 but after that it falls flat. It's better than stock but not a whole lot better. I could only muster 99mph at the track which is pretty sad with aftermarket heads and 3.55s. I think I'm still starving for fuel because I get detonation sometimes (timing set at 12). What's gonna open up my engine beyond 4500?