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I am not real sure why you are real concerned about gas milage. 8 miles to the gallon is not real bad at all on a hopped up big block one tip I can think of is to stay away from the manual sec. look for vacume if it was me I would just spend the money and get a 750 double pumper and a jet kit also if you over jet and let it run rich you will lose power my buddy has a chevelle with a 396 it is bored 30 over has the 375 hors heads a high rise dual plane intake and the 282 magnum cam which is a pretty hefty grind we run a vacume sec 750 and it has a 50cc accelerater pump and has not been rejetted and runs good with a slight bog but only sees a best of 10 miles to the gallon. I think if you are going to try to get any gas milage out of this motor look at an edlebrock they have a new 800 out I think will work perfect and they are much eisier to work on than a hooley of a q-jet good luck
 
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