Stock Minarelli Porting

Hey guys, just wondering if anyone could help me out with the porting of my stock minarelli block. Just wanted to kno how high should i raise the exhaust port and if i should make the exhaust fully round where it meets up with the exhaust. Im new to porting so i dont want to try anything else really...but what would i gain (if any) from touching the intake. Thanks in advance for any help...
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