Crf70 into a 50

The case on my 50 motor is broken, its got a kitaco 88cc light bore up kit and a taky cam with a kitaco inner rotor, it also has a 18mm kiehin carb with a uni filter.

The power was ok but nothing great, but wanting more, iv just got a working 70 motor for nothing, can i swap over the 88 barel to the 70 motor, also iv heard that the 70 head has bigger ports and valves is this true? so im guessing that this would give a notable increase in power due to my 50 running a total stock head, also is there any kind of high comp piston that would fit the kitaco 88 barrle, like a tb race head piston or some kind of 88 kitac piston

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