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Just send it to a good engine builder. There are a few that have proven them selfs to to good work. Porting will make a normal 660 got from mild to WILD. Don't go cheap on the porting for this. I think the Extrude honing would be better for other things but not the raptor. Send it to a good porter and it will make your 660 scream.
 

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Just knock a few chips out with a hammer and screwdriver, that's all you need, lol. I'm playin', don't do that. +1, send it out to a proven shop and have them do it, you won't be sorry.
 

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Extruded honing is just forcing grit through the ports. It is more or less intened for intakes with long runners where you cant get to with porting tools.
 
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