[NORMAN BARNARD]

Venturi's warped or metering block, quick check, move sec. Metering block(assumed it's not leaking) to the end having problem redo fill bowl and recheck for leak. If no leak it's the venturi.......mill flat, but recheck for clearance of p/v and stud boss in the area. I
ve had some come thru with "excessive" dichromate/bright zinc that would not let the plate gasket seal to the venturi and it dribbled out the off idle transfer slot in the base plate.

One more item to check, the cast in dowel pins in the metering block maybe bottoming out in their associated holes, place metering block minus gasket against venturi and check end-end and side-side for any "rocking". If there is, drill the holes or grind down the pins to fit the hole depth......