The only spacers I've seen, and used, are for the B1 originals. Although the ports were tiny enough so that they could probably be matched to standard or MW port dimensions. And that's because Koffel didn't make a tall deck manifold until recently. I have a set of B1O's on a megablock, and doing up the intake was kinda PITA. It did make for excellent port matching to the heads, but we wound up dowel pinning and set screwing the manifold to the adapters. I would have sold the manifold and bought the tall deck version, but I had gone through a bunch of clownery getting injector bungs mounted and welded to the manifold already.
I've heard nothing but good things about the TF single plane, that seems like a good idea. S/F....Ken M