Get yourself a Trail Bikes Big valve head... I think retail is about $200 for just the head.... they rip without any porting! I would stick with a Takagawa or Kitaco piston though..... you could just have your valve reliefs cut open a little bigger on the piston you already have.<--- I have done this with a dremel before.
Stock lightened flywheel is the way to go.... fuc inner rotors, they run good, but too much work through the corners.
BBR Permimeter frames are overrated! They look good, but I didnt like the way it handled compared to the same bike (suspension setup) without the frame.... It felt more top heavy, this was due to it being a couple lbs. heavier, and the way the frame is shaped it put more of the weight up high.
A friend of mine is a dealer for Trail Bikes, Classic Honda, Red Baron, Two Brothers, Thumpstar, Pitster, and some others...... If you ever need something, let me know, I will see what kind of price I can get it too you for.
If you still have stock Zoke springs in your zokes replace them with MiniBike springs..... makes a world of difference... I think I ran 10 wt. oil.
Have fun rippin that beotch! You should try to come down to FL some time..... the tracks here are unbelievable..... a couple big races coming up around bike week.