Thats a good idea, but unfortunately there is Not enough room to reach the screws under the fuel pump/diafragm :-(Yeah, your manifold has 2 extra bungs.. sweet... so you'd remove the 4 studs from manifold, uses counter sunk Allen's to hold your carbs to your plate, and use the manifolds extra bungs to hold the plate to the manifold. Gaskets above and below your plate...
No need for a thicker than normal plate