Need recommendation for a Carb for better MPG!

RustyRatRod said

A Street Demon 625 would be a great choice, but 17 is pretty good for a 340. What gear do you have? I think expecting 22 or more from a 340 is something out of a fantasy movie. That 1406 is already an economy carburetor. The 1405 is the performance version. I'd check your tuneup first. Where is your initial and total timing?

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OK, I can appreciate that, thank you! Yes, it probably needs a tune up. I'm not a mechanic but I want to learn so I'll take any and all tune-up tips you might have. It was sitting for a while before I started driving it again. I had a 2brl 318 in an automatic Duster as a kid and could get 25-26 to the Hyw. Is there really that much difference between a 318 and a 340? The 340 that I have now never had that much more noticeable power than the 318. I'm know a lot could be done to make it stronger but that's not what I want unless it's derived from more efficiency.