there are alot of good builders out there that can hook you up. here are a few
k&T
rudy kurtz
packard racing
redline
I get all my work done from Jim at passion racing.
white knuckle racing has them. (filters)
for dunable overrides
jim from passion racing
redline
dave moore racing
there are a couple more out there just cant think of them.
I would go with rudy kurtz since you want to go with someone close to you. He builds some sick bikes, but if you want to send your motor away then I would go with Jim from passion Racing.
when I tear down mine this winter I will get pics you should see how its done its pretty trick. Jim from passion racing done them aswell with the rest of the motor