I Have a 66 Switch Pitch Trans 400. Why do you think that the carb is not the right one? I have to admitt that I am no expert on carberation at all, I spoke to the tech People at Edelbrock and they said it would work.........I had thought that the 600cfm would be the best but then I was told that this carb would work

.Plus I got the carb at a good price "FREE" So Maybe this is not the best one?
What do you think is the best way to go?
Thanks for your reply and help