Make sure you run manifold vacuum to the evap shutters! They are designed to close when there is no vacuum, ie shutdown so the fuel bowls dont evaporate into the air. With no visible vacuum lines, I see a choked air cleaner.
Hmmm, are you sure about that? I don't know myself how they operate for sure. But I can tell you that with out any vacuum lines hooked the doors in the snorkels are wide open.