Well, if the weight offends you, a Benz OW617 engine would weigh about the same as your small-block and give you good mileage and outstanding durability.
30 MPG would be a snap for it. And no cantankerous EPA-limited electronics.
BUT...the acceleration would be terrible, even by eco-modder standards and getting a manual transmission to fit probably involves a trip to Germany.
Maybe, it you never load it much a VW TDI engine might work.
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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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