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Might I recommend a 6.2 diesel?
It (like the 6.9 diesel) was designed for fuel economy not power.
The vixen was just a GM c20 extended cargo van with a full fiberglass shell and extended control arms.
Couple appropriate rear end gear ratio, with a c-code motor and a 5speed stick and the 6.2 achieves 30mpg in an oversized boxlike vehicle.
Some bread trucks came in a stick shift form with a 6.2,
6.2s may only drive 200k under heavy use but the blocks can be had for as little as $50 and rebuilds top to bottom start at about a grand.
You will find GM platforms are easier to locate and cheaper to maintain despite motor issues.
Having owned an oversized 7.3 casino bus, never again comes to mind, everything but the motor was garbage and rednecked.
Just my 2 cents
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