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HybridZ

Carb and Timing Help


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I have a 74 350 sbc with a holly 4bl carb in a 72 240z. Engine looses power around 1500-2000 RPM and backfires through the exhaust. I have replaced all ignition electrical: points, plugs, wires, cap, rotor,and condensor. I set the dwell at 31 and the timing is set at 8 deg btdc. I tweaked the mixture screws and got some minor improvement e.g., when I stomped on it in 2ed gear it took off like a rocket, but then crapped out at about 2500 RPM. The carb is very old and I am thinking of replacing it. Any suggestions on getting the car tuned smoothly and for a replacement carb. Also, When I let off the gas at any speed the engine backfires through the exhaust.

 

Thanks

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