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2bbl carbs only stick to 2 air fuel ratio ranges. You will never be able to tune one for lean cruise and wide open throttle that doesn't cause bad preiginition and burned exhaust valves.
2bbl carbs are typically tuned to run rich in the mid range so they don't lean out too much at full throttle.
Which is exactly what you don't want.
As far as I can tell the only reason people use them is because they are cheaper or out of ignorance.
All holley race carbs are fuel dumps. Good fuel economy was never a design parameter.
A new Edelbrock 650 is around $360. Air fuel ratio meters are usually under $200. The Edelbrock advanced tuning kit was around $80.
Then you will need some kind of adapter or a different intake manifold so you can attach the carb to the engine.
You could likely double your fuel milage with just that.
Unless you get the engine running right there is no chance you will be able to double or triple the MPGs.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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