SX/SXi/SXi Pro 750 engine mods

I have the engine out of my sx to do the crank drain delete. I am considering having it bored and ported. anyone have any suggestion on how big of bore i should go without ruining the integrity of the engine? also is there anyone in west michigan that has some sort of a rep for doing engine work that I could take this to?
 
Hes in norther Ill. I think it only cost me about 15 bucks to send him my cylinder from St. louis. Yes thats all he needs. Or you can go a step further and he can mill your stock head. I did that along with a set of pro-x pistons and am very happy with the outcome.
 
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