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I have no idea where to start... when i stomp on this truck it might run about high 13's... It does not light up the tires as i would expect it should. (without using the nitrious) It sounds like its breaking up but i've cheched the entire ignition system. I have replaced the plugs, plug wires, rotor, and cap. I checked the timing last night - its good. the carborator has 65 jets in it which seem somewhat small to me but it doens't act like its starving for fuel. It anthing its already running rich as it should be for the NOS. when you step on the gas it falls flat on its face until around 3000 rpm... anyone have any suggestions?
 

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first thing first

Get rid of the 305 heads......no good......what is the compression ratio .....what type of fuel are u running, if its 9:1 compression ratio do not run racing fuel ur just wasting money and could take a chance on messing your motor up
 
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