Darn forgot to bring the carb sheet home.
Let's start with the power piston and metering rod. There is NO direct connection between the throttle and the power piston. The only connection is the vacuum at the throttle plate. At maximum vac the metering rod is held down in the main jet limiting. It should not be closing the jet off. The carb sheet in the kit for rebuilding the carb will give the metering rod setting for your engine. You can then play with that setting for best performance or mpg, but start with correct setting first. When you open the throttle the vac comes off the power piston and the spring under the piston raises the metering rod allowing more gas thru the main jet.
Do a search on the internet for "rochester monojet tuning" there is a lot more information out there than I could possibly type in the next year.
Larry
