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Well..........it will be more fun, have a 4bbl carb and you will have a hard time keeping your foot out of it. I doubt if you will see better fuel economy, the engine will run better and more efficiently than a 30plus year old engine but it would depend upon HOW POORLY that old engine is running right now, if it is a stocker 2bbl then you are probably getting 15mpg or so, which isn't too bad in a big B body car, although the emissions crap on the '77s was pretty bad, and with a new engine you can leave all that off. It is probably a toss up. At any rate, let us know what you do.
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Dan
'46 2 door
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