Check the timing and see how high the total advance is. rev the motor to say 3000 rpm and see where the timing is there. also pull one of the new plugs and make sure there is no burrning or oily buildup on them. Look in a service manual they always have a plug diagnosis guide. tell me how it turns out.
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73 coupe, 351W, GT-40 heads, edlebrock 750, offenhauser intake, .488 lift cam, 2.5 exhaust, 2 chamber flowmasters, blah, blah, blah...
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