couple ?'s,, I'm running this carb on this manifold,, how did you adapt,, the offy is set up squarebore, if you removed the plate and fabbed up a spread to square flange carb adapter,, some q-jets don't like to run with a floating middle,, meaning one giant hole for the gasket,, you can buy a thin spreadbore plate to solve this, it may help feed correct vacuum to the passages that need it,, I also had an issue w/ a q-jet that came rebuilt and somehow a 301 pontiac base came on it,,"turbo application", the carb never ran right, there is a vacuum passage removed that attaches to the primary rod passages, there is a stagigic hole that can be drilled to make it a standard base,,,if the vacuum doesnt get there it runs way lean and screws up the primary circuit,,,, weird carbs to get used to working with,,,q-jet rebuilding by Cliff Ruggles is a 'bible',, if ur gonna get into these carbs,, to see if the primaries are funtioning there is aliitle plug that is removed top center of the carb, if I remember right they pop up under throttle if they always stay down they are messed up,, if you have an 'apt' q-jet these are adjustable and sometimes get stuck,,,