Offenhauser Dual-Port 360* Intake ~ 'Was It A Gimmick'

Tried one of these on a '72 318 Swinger in '73 with a 600CFM Holley with vacuum secondaries. At a full throttle stomp from idle, it had a massive bog when the secondaries opened that I couldn't tune completely out. If you rolled into the throttle and let things progress at a more sedate pace, no problems, but that wasn't as much fun. Replaced it with a single plane Torker that wound up on 3 more cars...