Definately change the cams rod if you want to raise your record even futher! Looking at the revs you needed to pull 200mph and your dyno graph you can see the power band or the gearing needs shifting slighty. I know you love your torquey engines and mark has produced that for you but I reckon you need to keep the engine on the boil at over 7500rpm and maybe sacrifce a little of that midrane ooomph

Or maybe I'm reading the graphs all wrong and missing something! apologies if I am!

The exhaust is deffo a good idea though

Good luck