Good evening, im new to this forum, I have a sbc 400 30 over, with 2.02/1.60 64 cc heads, Holley 750 dbl pump with the Edlebrock RPM air gap intake. The cam is a comp cams Xtreme Energy 292H Hydraulic Flat Tappet Lift .501"/.501" The car is running fairly well at idle, but im only getting a vacuum of 9.5,,, is this expected? i feel it is very low and contributing to the hesitation off idle to WOT. also it seems to not rev as high as it used to with a 282 cam and a 650 Holley vacuum secondary.. am I missing something ? I have disconnect all the accessories to ensure there is not a vacuum leak, there doesn't appear to be one because as soon I pull off one of the vacuum ports the idle goes up quick. also I am having trouble keeping the primaries closed in order for the idle circuit to keep the car running, i have to have them open slightly to idle at 950 or so.