I am gathering parts to build a stroked Rover 4.0. I have a set of Buick 300 heads I want to use, but would like to install a set of larger valves. I intend to replace the seats to match what ever valve I find to run. What I would like to hear is from others that have put larger valves in a Buick 300. What valve did you choose, and how did they work? I am willing to cut to length the stems, or even go to larger guides if necessary. So I ask, what did you do and how did it go? Thanks!