3rd redo of installing the super six manifolds....help with gaskets

Great ideas you guys. For those hard to get nuts, I had my son use a straw and slide it on, worked, then he said he was done. teenagers.
So update, today I got into it with this manifold, I loosened everything, including the mating of the 2 manifolds. I then cranked down on the nuts/bolts (3) that mate the manifolds, then I started tightening the nuts on the manifolds n the correct order. I did not remove the manifolds, not did I install a new gasket, and I did not put a gasket at the heat riser, just left the 3 hole metal piece. Started it up, no leak. However I did feel a tiny, thin, puff of exhaust coming directly out of the heat flapper stem. Crazy, nothing I can do about that I suppose. Maybe enough carbon will form and plug itself. Thanks guys for the help. Now what do I do with my original manifolds 1bbl? these fuckers are heavy.