[ryanheacox]

You want the gas level ~5/8" below the gasket, some like 15/16". A good rule of thumb is to have the seam of the float at an even 1" from the casting with the upper half flipped upside down. This info is all for the Zenith. You also want the cap jet to have a depth of 7/16" from the machined surface of the lower half and the main jet to have a depth of 3/8".