You can get over 300 easy without a valve seat change.. Say 325?

 

As Max pointed out the stock 110 heads flow more than some would have you believe, I put a 58 on my 2016 110, it was a change on its own, had already changed the cam, road tuned it and the VE's changed dramatically numbers wise, no conclusive evidence that performance went up by much (no dyno) but it made a difference nearly everywhere by seat of pants.