I just put a 57 b intake and holley 390 cfm on my  55 with a stock 292 and A/T It had A intake with a 4v teapot before/ it sure rans alot better but I have a small stumble when I take off / so far I have check the float level,accelerator pump arm adj,move the pump cam to the #2 postion Im starting to think that maybe I need to replace the pump shooter which is a .25 but Im not sure which way to go. how can I tell if Im too rich or runing to lean? both can cause a stumble or do I need to change my pump cam? Also when my secondary open I feel a kick which I think is a flat spot I think a stiffer spring on the secondary will take care of that problem The cars has 20 lbs vac at idle, I have try runing the timing at 6 and 12 %  with total adv of 38% at 4k also the distributor was update a year ago and it also has a new fuel pump Im hope that someone has has had this same problem and can tell me what fix it

Mark changed his - probably the right move - but I just put an orfice in mine. The hose didn't fit tight on the Demon PCV port tube size either and I finally used a hose clamp on it to eliminate what I believed was a vacuum leak. And just as you say mine tuned right up after I started getting rid of some of the excess idle air coming in there. 

I made this little fitting - used the '64 truck PCV and bolted it on the back of the T-bird valley pan - put the orfice in the other end of the hose up by the carb. I'm sure there are some better ways to do it if you building a motor - Dutchy and Tim have been drilling and tapping a bolt hole on the back of the lifter gallery for a screw-in AC part - really looks PRO.

 
 Steve Metzger       Tucson, Arizona