I replace my 350 motor with a 400. I put summit headers 1-5/8 primaries on it. hei ignition also. set timming to 16 degrees btd. plugs gap to 60. I put # 46 heads on it off of my 350. cr should be around 8.5. problem is when i put pedal to floor runs great. burn the rubber off my tires. when i drive normal, car seams sluggish. no get up and go, unless I floor it. Is back pressure a problem, or my timming. 670 street advenger carb is on it. motor is pretty much stock. I need advice. thank you.
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