The 4b set will burn a little more fuel I would think Over your 1b.(stock cam) NOW here Comes the BUT now if your changing Head cam & intake. This could very well be a different matter. As to if you would get better Or Less MPGs. So if your just looking for a little more bang and still retain some good MPGs. Here my 2cents in this matter. Small cam RV style maybe Just a little over Offey Intake. and the Holley/Weber 2b from Tom Langdon Dual exhust. and I think you would be pretty happy with the out come. Hope this helps
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