If you swap a Quadrajet in instead of the Edelbrock 1406, you will likely see better results. The Quadrajet, if it can be made to operate correctly, has small primaries, which give superior mileage than the rather large primaries on the edelbrock. The Edelbrock has a maximum of 600 CFM, the Q-jet, with secondaries, is 750, for better max power flow as well.
What exhaust are you running?
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jku Cornville, Maine
68 C10 burb
42 Willys MB
46 Dodge WF-32 1.5 ton
53 & 56 Olds'
60 Cadillac
22 Dodge Brothers
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