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If you're going to do that much work to your engine, you might as well bump compression too to increase thermal efficiency. If you still want to run 87 octane fuel, you can probably set up your engine to do that by doing various things like using colder plugs, retarding timing, etc... Or if your area has e85 you can use that and not worry about all that. The benefits of raising compression start to diminish once you get to about 12.0:1 CR.
You will also need to do some drastic aero mods to your van if you want a "super mpg" vehicle at highway speeds.
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