20 years ago a friend had the nascar intake on his 64. He made a top out of 1/4” aluminum with two AFB carbs, cross ram. He drove it 50 miles to shows once a week plus around town a lot but never said anything about any problems with it. Haven’t talked with him in awhile so I might call and ask him. To me it sounded good, fired right up and no attitude when leaving the shows.
Dean Nicopolis had one with a crossram top. It looked like it would work better than the single 4bbl to me. My thought is two of the Autolite inline 4bbl carbs might be a trick way (and expensive) to go with that bottom.
