DeuceCoupe, I remember the carb shootout pretty well. I believe that you were running a near stock 250. IIRC the 390 Holley was able to be stomped to the floor off the line, the AFB could not. How big is the primary barrel and Venturi on a Holley 780? Are the primary and secondary sides of the 780 the same size? One thing that I have read about is a new to me size of the small base Rochester 2gc. The one that I am fimiliar with has a 1 7/16 bore with a 1 3/32 Venturi that flows 278 CFM @3.0. The one I just read about has the Venturi size increased to 7/32 and was rated at 311 CFM @3.0. Has anyone on this board actually seen one? Jay
