What about the type 5 engine (Vanagon oxyboxer)? Not sure how many ribs the case has, but from what I understand they're supposed to be a lot stronger, can be converted to accept type 1 crank and heads, and run air-cooled.
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'66 Bus(11-window, CLK rims, disk brakes, IRS, bags, hydr. clutch, Super-1600 w/injection)
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