Has allot to do with spark duration. Anything over 30K would need a Platinum or Iridium Plug.
I don't recommend the wizz-bang plugs or E-3's in these old Dinosaurs. JMO.
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk
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