I have seen those 2 into 1 adapters before. They seem like a real bottle neck for air flow compared to the 2 barrel. I dont know, I am thinking about the 38-38 webber as its a little larger then the 32-36. I guess I need to get a different manifold like the clifford though. I have not seen a offy close enough to tell, but it looks like they are setup for a 4 barrel only. I do have a brand new edelbrock 600 sitting here but that may be to much carb for the amount of motor mods I have.