The alcohol in the fuel is hard on rubber parts. You can use Emory cloth on a flat surface to knock down the high spots. Try using the Superformance gaskets on the bowl, metering block and accelerator pump after you get the surfaces flat. Or at least use the non-stick Holley gaskets.

I usually recheck the torque on the carbs a few times and often find a screw or two that needs a bit more tightening after a few heat cycles.