Holley stumble trouble
Maybe.
See the holes in the upper doglegs?
Originally those were for the "emulsion tubes". If the e-holes in the channel are bored through, then odds are there is no emulsion tube.
Another check for the tube is to look at the top of the meter block. My understand is the tubes have top that flush because its a solid brass piece.
Otherwise the wells are sealed with a cap.
I htink I posted a link to photos earlier in the thread. if not I'll find it.