Unported head quickness?

chassis is a factory with frame connectors narrowed dana with 40 spline spool strange axles 40 splined 5:13 pro gear 29.5x11.5 m/t .095 x3" drive shaft,liberty clutchless 4 speed,launch at 6,500 shift at7,000 pulls through at 7,600. also is a ladder bar set-up.engine will go to 8600 but power peak is around 7200 to 7800.