2bbl Intake... To Make or To Find?

I have no hard numbers from a time slip. When i did the a/b swap, i was experiencing carb issues. My butt-o-meter was that the clifford was superior in all respects from the offy. I attribute this to a larger plenum, and tapered runners.

The offy is just a copy of the 1v intake from 1959 with a flange for a carter wcfb carburator. But then i have noticed different appearences with the offy over the years. Which makes me wonder who is casting the clifford manifold.