DrEvil,
Another viable option would be to find the 72cc E-heads. They'll bump your CR up to 10+:1 on a 400. Lots of guys doing 455/stoker based combos would buy your 87cc heads. You may still want a cam change but that's much easier than pulling apart your bottom end for a crank swap.
Stu
Edit: I see vtxman already said that.
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