If anyone was at Hannibal this weekend you know what I'm asking about.AC is running a stock 5.3,the harness is from Howell and they sent the computer with it.We don't know what RPM's he's turning,may find out this week wiyh a tack.We need a little more for the straight aways.He hits the rev limiter about half way down the streches at Hannibal.What suggestions would anyone have to gain just a little more.We don't really want to do the cam,lifters and springs yet but if that is the best way we may.Thinking about a programer,LSX intake and a bigger throtly body.One question is what would be a safe RPM for this engine without poping?Any input would help greatly.Thanks