[Rick Parker]

Dean:
On the 427 FE, because the Carb mountings are angled at 10 degrees it causes issues that are not inherent in a SB application. Specifically when the carb is tilted towards engine centerline 10 degrees, the opening from the main well to the auxilliary venturi is lowered (compared to being mounted vertically)causing the fuel to drip, because the fuel (although level in the float chamber) is now higher towards the inside and lower towards the outside (of the bowl). Although it is possible that you have a couple of marginally acceptable fuel valves (needle/seat) I would continue to incrementally lower the float level until the dripping stops. The heat soak can be significantly reduced with the .100 thick gaskets available from various sources.

PS: With the carb top removed immediately after this happens remove the main jet assembly and see if you can visualise the fuel passage that connects from the Auxillary venturi to the jet assy. The fuel level in the well will need to be right at the bottom of this opening (after adjusting the float level) to prevent it from it drippping and to allow the mains system to transition without hesitancy. Clear as mud?