340 fuel/ignition issue?

Apart, all seems good. I may have had something in one of the needle seats, not sure, but cleaned everything out again, and will reassemble.
Checking my base gasket, all gaskets in both rebuild kits seem to cover the same holes, and be open in the same places, the only difference is in the center, and I'm not sure what difference this would make. Like this:
TQ base gasket.jpeg