max performance from my 810

well this winter i think im going to slow down a bit on building my kz1000 dragbike to better my 810.(still will continue to get worked on frequently, but might have to take a back seat this winter). I have decided that i might as well spend the money on my bike that is actually complete and perfect it before getting deep into another one. I want to get the maximum performance out of my 810 as possible while keeping it driveable. Mainly i am focusing on the head. I am using an 85 gpz head/cam setup. I found the megacycle website to be very helpful. www.megacyclecams.com/catalog/pages/page%2045.pdf I was kinda thinking about going with part number 471-10. Is this too larger for a street bike? Also i plan on getting the head ported somewhere, and was wondering if anyone even sells larger valves for the small fours? Also, will the stock BS34's that i am running be able to keep up with this? I am using a 140/70 jet combo. Any help would be greatly appreciated.

check out APE. you can get big valves, porting, valve jobs ect. Jay can tell you all about it