Would like to see Any and all comments from the guys and gals in the know on this subject. (OP original quote ^^^)
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Just a few questions to help understand your final goal.
What is the starting point of your '66 273 e1ngine? Stock build, stock cam, 2 bbl single plane with 2 bbl carb like this intake below?
Or being a Commando is it a factory 4 bbl.