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

I put one on a 273 when they first came out. It worked OK but I didn't see any significant difference from the 1966 iron manifold I reamed the bolt holes on to fit my 64. In 77 I put one on a W150 with a 360 and it worked well and, I think, actually made it a bit stronger in low end pulling. (Just seat of the pants observations)