Readings from the ported vacuum outlet on the carb- these were taken with a cold engine but I don't think this matters as I don't think we were looking for exact readings. But long story short, I was reading about 14-15" Hg with the engine running around 700rpm. Lightly blipping the throttle, the vacuum reading dropped momentarily to around 5"Hg before returning to previous reading.
Unless I'm not understanding something correctly (and that's entirely possible) I would've expected the reverse behavior if everything was running correctly?
