Hi guys, in general if an engine is going a bit lean in outsides and inverted do I raise or lower the tank.
Thanks 

   Lower.

     Brett

It will be interesting to see what others suggest.  I'd go with taking a dremel to it and gouge out a lower home for the tank, then possibly sister on some more beef to the beams if you end up taking a lot.  Is that a balsa floor between the tank and beams?  That could be the first to go.

No the tank is on the beams. 

   Open up the tank and move the uniflow vent lower.

     Brett

Interesting ideas.

The custom tank with lower pickup / vent might just work.

Moving the outlet of the NVA also might work.  Depending on how much movement is needed, arranging where the hole in the venturi goes by drilling a new hole in the venturi itself could be considered, perhapos combined with tapping the case for a set screw.

   When all else fails I would " consider " raising the engine  or making a thinner tank.
           John L.

Curious as to why moving the vent is suggested vs. moving the pickup.

Moving the uniflow  vent up or down will effect your engine run, I set my clunk tanks up the same way, that way you don't have to raise or lower the tank you simply move the uniflow tube up or down, I thought about using a clunk tank for the T-Bird but didn't have enough room.