Need recommendation for a Carb for better MPG!

About 18 years ago, I see that I took out the 323s and put in 294s. Would it be worth going down to a 276? I guess I would have a 294 and 323 to trade/sell. In the meantime, I'm going to work on getting the 340 tuned. You guys are wonderful!
Nope. Not at all.