Nex. The picture on the cover of Hot Rod looks like one of the 2 sets I have. The straight one I have is 2-1/4" and the second one is canted and is 2".
tlowe. Your Summit direction was the ones Holley makes I was refering to and to me would work on any engine, 4 or 6, They are made for 8 but all would work. I believe Edelbrock makes one too.

216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later