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Motor is a 350-300hp crate motor, stock except for headers and a Holley 700 cfm carb. No problem at idle or acceleration. Was wondering if maybe it could be a little rich on the primaries with the stock 700 carb.?
 

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you need to check the timing at crusing speeds to see if its got too much timing or possibly you could have an igniton miss like a wire arching to the header tube. Are you running vacuum advance? disconnect it see if the miss goes away. Carbs that come out of the box are usually 2-3 jets sizes rich but not enough to cause problems. Be sure the float level is correct.
 
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