You won't see much fuel from the venturis (or more than likely any). There is a small jet on the side of the primary throat that does fuel enrichment on acceleration. You can tell if it's working with the engine off by simply cracking the throttle open. It should have a visible stream of fuel every time you open it from full closed throttle. No fuel = bad enrichment circuit (diaphragm in the housing has failed/blocked jet). If it's weak, the diaphragm is getting tired and is due for replacement (it is part of a rebuild kit - the square block on the side of the carb with a downward facing linkage is the accelerator enrichment pump assy)

If the carb has been off or the fuel lines have been replaced, make sure the fuel line orientation is correct. Swapping the main fuel line and accelerator enrich pump lines will cause a near full fuel restriction problem, swapping the fuel enrich pump and fuel return line will disable the enrichment circuit.

OOC what symptoms are you finding that indicate a no fuel flow problem? Give the top of the carb a good tap with a screwdriver handle if you think the fuel float is jammed. If it's a no fuel delivery through the carb, try sealing the top of the carb with your hands and get someone to crank it for a few seconds (might be enough to purge the carb)