I just bought a Revhard stage 2 kit and I currently have the head off of my motor. I'd like to upgrade the internals just to be safe enough to run 6-7 pounds daily and maybe 9 at the track. I have a fuel pressure riser, fuel pump, fmu, and fuel rail so far. I have the head off the motor right now and I was planning to get stainless valves, new valve seals, new valve guides, and a block guard. How does this setup sound? Should I bother with springs, or retainers or anything else??