Granted these Carter/Eddy/Weber carbs are slugs. Dave Dudek, pure stock Super Bee Factory stock 10.92@127 Doug Duell "Dragon Wagon" N/SS 9.39@145 DVW 64 Belvedere N/SS 9.25@147.7 And lets see what have I done to mine? Metering piston spring change, secondary jets up 2 sizes, removed the choke blades. Gee that was hard. For what it's worth Len Adamacks 63 Plymouth N/SS was faster with Eddy's than Holley's. Ya it's a slug also. 8.99 @151. Duell's car now has Holley's still runs the same class, no miracle speed improvement. And yes I also have cars with Holley's. They'll all work . Doug