Which transmission? 3spd 727 auto, 3spd stick, wide-box 4spd, close box 4spd? What size tires? Soft-top? Lift?
What kind of mileage are you getting right now that makes you want to get more? If you're doing better than 15mpg, just leave it be. If it's down around 10, you might be able to improve it.
A good tune-up is a good place to start. Use the Autolite 85 plugs.
Make sure the 2bbl is in proper working condition. Have the carb rebuilt, and have it tuned - make sure the accelerator pump and choke are both working just right (just enough acc pump, but not too much). Be sure it's jetted correctly.
Or.. better yet, instead of dealing with the 2bbl any longer, step up to a Holley 2D Digital ProJection fuel injection system with closed-loop. That would be the best solution for keeping the carb "in-tune"
A light right foot will go a long ways towards improving mileage. Keeping road-speed under 70mph helps my mileage a bunch.
I can do 16mpg at 65mph.. but 10mpg at 75mph. Granted, it's 10mpg empty or towing another Scout behind me, but it's still 10mpg. This is with a lift, soft-top, 33s, and 4.10 gears.
In town it's not that nice.. but I like stabbing the loud-pedal too much.
Where are you now so we have a baseline for improvement. And just how much money are you willing to pump into "improving fuel mileage"
The ProJection system is a bit under $1,000. How many gallons of gas do you need to burn at the improved fuel-mileage figure to SAVE $1,000 in fuel costs and make the investment worth while?
Remember, a new Exploder only does 17mpg or so.. and there's a $30k+ "investment" cost to get that extra 2mpg.