Here's another thing I just noticed today:
I took my EBU carb apart to replace the power valve with a new one, which comes with a new gasket.
The new power valves they sell are shaped different at the mating surface than my old ones which came from Daytona parts. And the new power valve has a much larger diameter gasket.
I put the power valve and gasket in the bottom of the main body and set it upright on a tuna can, then poured a half a tuna can full of gas down into the float chamber to see if the power valve leaked. AND IT DID.
I took it off again and dug an old smaller gasket out of my box of Daytona Parts gaskets and repeated the test. This time it did not leak.
Good thing I checked before putting the whole carb back together and put it back on the car!