Im gonna have to take the head off to replace the gasket here soon, and im looking to get some more power out of it. I want to get the head ported, but i know im going to end up getting my carb bored. I wanted to know how much it would cost to match the carb porting to the head porting, and how much power increase i would be looking at.

As of now i am running:
12.5:1 piston
yz450f crank
hotcams
Sparks big core (full)
Velocity intake 2.5 inch (no airbox)
180 main 48 pilot 4th clip on NCVQ needle

Thanks