I have 347 Sbf with 205 afr heads. In foxbody street car with c4 and 410 gears. Fuel system is Holley black with 10 an line to fuel log with two regs.12-803 on nitrous side. Engine has wet plate system stinger4. Jets N64 F46 150 shot. ? Is how these plugs look with 4 1/8 pass es on them? Flowed 5 psi with Steve flow gauge and timing locked 30 degrees.