Different types of honda gx200 engines

Evening.
Picked up a tapered shaft gx200 and was going to replace shaft with a straight shaft crankshaft. When I have opened the engine I have found a plastic camshaft and the crankshaft when removed has the bearing on it.
Can I still put the straight crank in with a new bearing and replace the plastic cam with metal as the gearing is different size than the straight crankshaft.
Thought this would be straight forward!
 
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