Is it the standard Holley 4180C ?
A view main root couses for flooding I would check even if the carb is reworked (assuming car is on horicontal base) :
- wrong adjustment of fuel level, too high
- too high fuel pressure, normal for a standard Holley is 6 PSI, flooding will start somewhere between 7 and 7.5 PSI depending on the needle valve condition
- not working or leaking fuel needle valve /seat
- fuel tank under pressure
- open the fuel filler and check again for flooding. If it is still flooding with an open fuel filler cap, the tank evacuation via the charcoal filters or the valve on top of the tank is not the problem, If not check the items.
- check fuel pressure and return line
- check fuel level adjustment and needle valve / seats for correct setup and shut off function. I allways replace needle valves with a carb rebuild
The 4180 normally has sealed allen head idle adjustments in the base plate and completely different primery metering block then the 4160 / 50 or 1850. So please don't put metering block service parts from 41xx or 1850 in the 4180 primary metring block side. Secondary metering blocks need small mods too if used from different carbs. Main metering jets are interchangeable
Double check the service parts used.
Next would be disable the EGR base plate function to see if the EGR circuit is causing problems.
