As mentioned Dan Dvorak is the man on a cross ram. I run the earlier Federal Mogul AFB carbs, they have a few minor differences. My 3200 lb NSS car ran a best of a 10.00 with the old cross ram, I could never get it faster, and Dvorak said that I was wasting my time trying. Two other guys in NSS are at the same ET and nothing seems to make the cars go any faster. Put a homade inline manifold with same carbs on mine and it ran 9.78, When setting up your fuel system the needles and seats are the main restriction, I machined little windows in the seats and drilled the air horn to make them dual inlet. Really improved the stability of the airfuel readings.