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Centric -
The orientation of the fuel filter sounds fine - they don't care if they're vertical or horizontal or what - as long as the fuel is flowing in the right direction. Should be an arrow pointing away from the pump, toward the carb on the filter itself.
The airspace you mention is really not a problem. I have SUs in one 122 (with a larger air space than you mention), a DGV in a 544 (same air space), SUs in another 122 (with a big ol' airspace), recently removed a pair of DCOE side drafts from another 122 that had a 21300cc big bore (and always had an air space) and am now running a single DCOE with a V-Performance supercharger.. and even that has the air space.
None of these fuel setups has ever provided a completely full fuel filter. All of them leave a visible air pocket in the filter. No big.
If you're stumbling on acceleration, I'd bet your acceleration pump jet is too small... or the idle jet might need to be larger (and then the idle mix screw leaned out a bit). The float bowl in the carb more than accommodates the amount of fuel used on acceleration, regardless of air pockets in the filter or line.
Depending on your timing - ya might try a hair more advance (not more than about 22 degrees at idle though), then readjust the idle speed back down and see what that does...
Viva Italia! Or l'Espagne, depending on the Weber...
Best,
Cameron
Rose City
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