I've got a used Demon 750 mech sec. This thing has ruined two sets of plugs. 360 .30 over,MP528 cam, EQ heads with 2.02/1.60 valves, Performer Rpm. Insanely rich. Black smoking. Pissing me off. Primary jets are 72, sec are 78. 45 power valve in front.... Now the rear block has a plug in the...