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81 rm465 porting mods and specs needed

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I have a 1981 RM 465 new piston first over rebuild I want to know specifics on transferporting mods.. Can I cut piston skirt on the intake side to allow a lot more airflow and can I raise the exhaust port to allow for higher rpm?. Parts for this bike are very pricey and it took me weeks to get them.. I don't wanna make a mistake all input is welcome

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What are you trying to do with it? Do you have any porting or hop up experience? It should have plenty of power. If not just send it to someone like Eric Gorr for a proper porting job. You can pick the type of power delivery you want. 

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