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I would get larger valves, 2.0L had small valves except for the 914. Unless your heads are badly deformed from overheating, they are probably rebuildable. You should change seats/guides anyway, especially on a bus. It won't be cheap but it is necessary. Check with HeadFlowMasters for rebuild prices/exchange. 1.8L heads (carbed) had 41X34 valves, probably good for torque. I would go with a fairly mild cam for torque. European motors make some heaterbox eliminator tubes that go to a header.
You should use your stock cam gear, it is matched to your crank and block for the correct backlash. It will take a little machine work to fit to a Webcam but worth it.
Oil pump: 26mm type one pump (schedek?) from Aircooled.net should be enough. Check with Jake Raby on the mods needed to make the pump work.
Places to get parts: Aircooled.net, European Motorworks, Fat Performace.
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