Definitely enlist the help of somebody with some experience! A log-type manifold can and does develop isolated rich and lean spots at certain RPM's due to harmonics, so it's possible for a multi-carb setup to go off mixture at oddball times and speeds. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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