can any one tell me what spacer or adapter to use to fit a edelbrock #1406 performer series carb on my 348 motor or what carb i can use with stock manifold

THIS MIGHT BE IT , but be sure to check

You need the WCFB or small base Rochester 4-Jet manifold to the larger holley/carter AFB. Be certain to measure the bolt spacing and check.

Brian

Brian thank for the information the problem i am having is that the edelbrock bolt pattern fits my manifold but the butter flys are too big to open in to the manifold thanks