[vintovka]

Thanks but actually, we went thru all that you have pointed out (several times) and everything is correct. Think engine cam may be root cause but it rums great. Pedal is very hard, truck does stop straight but power assist is weak.

At this point the vacuum pump is installed and routing the lines tomorrow. The question remains. How best plumb it to make most efficient use of pump and manifold vacuum? May still just "t" manifold vacuum into the line from pump to booster and see what happens. If this fails will move on to a HB.