i can't remember what you said your van had for a carb, but if it's a 2bbl, swapping over to a 4bbl manifold and running the small T-quad should yield a couple mpgs. however, you will need to learn how to tune the T-quad, and realize jets and metering rods are semi-hard to come by and may be a little expensive.
It's the 2210 and if it matters, the intake is the style with all the smog stuff... Not sure if I wanna go the route where I'll have trouble finding parts though...
