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For a 393W in a Cobra, suggest the 750 DP in Holley or Demon. Leaning toward Demon as they seem to work better, and are less touchy. Definately a double pumper for instant throttle response.
I have a Holley 700 DP on a 351. Power is "Right Now" when I crack secondaries in any lower gear.
For a 4000 pound sedan, 350 - 400 ci size engine, auto trans, 3.08 gears. Go vacuum secondaries or the engine will bog.
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