I had an 85 Monte SS when I was 18 that got 25mpg. All stock, HO305, 2004r and 3.73 gears with 235/60r15's. What about a small bore smallblock, 305 or 307, with good small combustion chamber heads, intake, a 4x4 truck/towing cam, and a Quadrajet, run it as lean as you can go without problems, Maybe you could find a dual snorkle air cleaner from a junkyard and run the snorkles down to the manifolds hor hot air. 2004r from a car, or manual. Small duals (2" or less) with an h pipe. Skinny& short 14's in the front, tall skinny 15's in the back. 30 doesnt seem unreasonable, I'm pulling 22 in a 3/4 ton truck with a 350 tbi/3.73's
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