I've done something, along that line.
48mm Webers have a throttle bore of 1.89 but, the Dominator has 2", 2 1/8 and larger throttles, so you can make a IR system with them and have more air flow than the Webers.
All I had to do, was make a 3/4 thick, 4 hole spacer, to get the throttles, up a little to make the turn and seal the lower Weiand TR manifold. No printing needed.