This is soooo beyond the shade-tree mechanic on so many levels.
If you want displacement on demand, go find a 5.3 or L92 GM engine. Their system works really well. Don't expect more than a 3-5% improvement in MPG.
You want mileage, swap in a Cuymmins 4BT3.9 diesel. There are now commercially available kits for that swap. Expect a 25-50% improvement in MPG.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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