[Commander]

what does the inside of the plenum look like

is it separated down the middle...two halves, or all open inside

if all open, then carbs too big, if divided, then only one primary set feeding half the engine...gets you into weber-think...one throttle body per cylinder instead of all venturi available for all cylinders like a 4v intake.

what'll wake that intake, and the engine it's attached to, up, is displacement. bore and stroke the bejebus out of it.