Which type of carburetor?

Hmm seems like no one here has used one... You don't need an adapter to run a square-bore carb on an Eddy Performer manifold, it has a dual-pattern flange that can accept either square or spread-bore carbs. I've used both myself, just use the proper gasket for whichever type of carb you are running.

Had one on a 318 once, first ran a ThermoQuad then switched to a Carter AFB and both bolted right on, no adapters required.