Mike, I am not sure about the gasket. But if you have had and maybe still do have dirty fuel, maybe the carburetor and main jet are gummy or clogged again. If you have another bowl gasket, you may be able to take the bowl off while the carburetor is still on the manifold and spray out any contamination with something like Berkebile 2+2 Gum Cutter. That stuff works well for me (Not nearly as good as it was in the early 70s.)

I looked at the exploded picture in the 34P manual and it shows two cut-outs facing the engine. But sometimes, these illustrations are approximate and not to be taken literally. I know it is frustrating.

(A little OT) I may be able to start mine today for the first time. I don't have the new fuel tank today. But I have just about corrected all of the "modifications" to the original wiring. My intention is to strap a 5 gal Jerry can into the holder on the driver side and put a 5/16 rubber hose from the fuel line to inside of the can. Wish me luck!