421 cub drag ported by k&t, 40 lectrons +7 timming, hv fuel pump.
This is not a plug chop yet but just heat cycles then had some problems with needle and seat. Got it all worked out, put new br9es in, cranked, ran it on and off for few minutes at a time, along with fatening the needles up and this is what I have and it scares the shit out of me. The motor at first crank tried to run away at times while adjusting idle and eventually reved high as shit and I attempted to kill it but it never happened so I pulled the plug caps off and it finally died. What's yall take on this and should I pull the top end to inspect.