I found this, shall we say, interesting quote from Dan Warner (son of Harry): "Don Ferguson III had the 300 MPH exit speed at Speedweek last year. He was using an original Wayne head."
I hope that's a typo or bad memory, we all know why.

I've poked around, and can't find any 12 port head with 45° angled intake ports and evenly-spaced individual ports as shown. All of them had paired ports, like SBC, BBM, etc.