zz4 with holly. Gaskets replace 2 times in last three years. It is leaking front bowl plus staring to flood out if driving reasonable it really loads. I have a Muncie. Are there any new style carbs that work with new gas?
There are better quality gaskets available for holley carbs, for example gaskets for E85 gas should work with any gas.
What comes to flooding, you really need to use pressure regulator, that is no particular holley problem, edelbrock/ carter style carbs are even more sensitive for flooding than holley.
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If your not using “reusable” gaskets that’s the first issue. The brown cork ones blow. If it still leaks after that, most likely it’s warped or possibly cracked near the bolts from over tightening. It happens.
I recently had to install a regulator on mine due to flooding. Turned out my Holley pump was putting about 9psi to the carb. Knocked it down to 6psi and carb seems much happier now.
55 Bel Air Two Door Sedan
350, 4 speed, 3:55's
Holley Sniper EFI