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Guess it might depend on the truck and motor. Have seen them on more 305 setups. My 84 c-30 350, came non-ecs. Cap & rotor shouldn't matter, the ignition module would. Non-ecs shouldn't have a vacuum advance canister on it.
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John
1984 C30 Chevy Crew Cab Dually
1998 Jeep Cherokee 4x4
2004 Chevy Trailblazer 4x4 (wife's)
1970 Mustang FB fully tubed (getting 521 BBF & powerglide)
1978 Nova 2dr (going BBCaddy & S.P. th400)
1984 Monte SS (circle track car)
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