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I HATED it when people stood nearby and watched me work. Sometimes we'd get homeowners watching us frame houses.
My process often included some cussing, refiguring, smacking stuff with hammers to alleviate frustration....I did NOT need someone around me to make it worse.
The BEST is the MSD # 83647 which comes with an adj built in rev limiter. It is physically larger than the std HEI module & has an exposed printed cct board. So it needs careful mounting in a protected area. Why it is the best is because it supplies 7.5 amps to the coil compared to 5.5 amps for...
Disconnect the pick up. Connect the p/up to your DVM, AC volts, low voltage scale. Crank the engine. You should see from millivolts to a few volts. Zero means p/up or adjustment is defective.
I use 4s in my all iron 455 Pontiac engine & also use 4s in a 487 Ponty stroker that has alum heads. I think next after using carbs that are too big....comes using plugs that are too cold.