Hi I recently bought 1993 lightning #5235 and it is currently in the body shop getting repainted. I was wondering how touchy the speed density is. The truck already has underdrive pulleys,the 460 air inlet and the timing is a 15deg. I was thinking about freshing up a set of gt-40p heads that I have-mostly to eliminate the whole smog pump set up including the pump itself. I was then thinking of using 1.7 roller rockers, a set of headers, a hypertech chip and an electric cooling fan. the previous owner said that the throttle had stuck on him so I was considering a 65mm throttle body. Has anyone tried other heads and cams or 1.7 rockers?