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Wow... taking me back a decade or four. In '79, I had a Ford van with a 302. It was a year of a gas crisis and I started running the numbers. In the end, I figured I could increase my economy enough to justify a few engine mods with a three year payback. And sure enough, the calculations were right. Now, remember this was in '79 when our only source of information was magazines and friends.
The end result was a much better fuel economy plus the power to pass a car when I needed it. Lots more fun to drive. Then again, I also added sway bars and KYB shocks.
I added an Edelbrock SP2P manifold (designed more for economy than max hp), a Carter 625cfm 4bbl carb with vacuum secondaries an headers. My economy went from 12 to 14. The biggest addition was a vacuum gauge. I drove with an eye for max vacuum. I also added an electric fan.
Good luck! Sounds like a fun project.
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