I have a breaking up problem. I've change msd (7al-2) to a (7al-3) and a hvc-2 coil,wires,plugs and timing set at 32. Did a complete wiring and fuel pump. I went back over the rocker adjusted then. In the water fine, once i leave and it shift in to high gear after the 60' it start breaking up. I need you fellow racer in put. thanks very much.