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Depends on application. If you are racing this thing only, then mechanical are the way to go. Street use usually goes with the vacuum secondaries. What is your timing/cam setup? Seems like it's gotta be more than just richness to blow flames out the exhaust.
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300 CI bored .030 over with a 240 head (303 CI). Clifford valves, Comp Roller Rockers, crane cam, Offy intake, true dual headers, x-pipe, pretty spicy.
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