I've had an Offy 360 tunnel ram for years. It has two Holley 650 carbs off a 350HP 68 Chrysler 440. For some reason that intake/carb combination has been the fastest intake I've put on just about anything from bone stock 440's to my old 10 second Dart. I'd never even change jetting moving it from motor to motor. I tested it back to back on my Dart with an M1 tunnel ram and the Offy was faster. It doesn't make sense but it is what it is.