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Couple of items stand out to me:

You will never be much below 4000 on the track
A stroker RB built big CR will have way more low end torque than you will ever be able to put to the track
You will actually want to use the cam choice to dial back the torque, and move the power band upwards
Almost all overtaking will be at the top end, before braking, if you are passing anybody exiting a corner, they are a dog to begin with
If you are running just against the clock, no overtaking, you can lower your power curve a tad.

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Well thanks for being communicative guys , I hasnt come up with that myself (yet)
Where can I find this Mike Young guy when he's at home?
Tyres are the enemy when it comes to circuit racing..

Ciao ciao, well for now.

Tom.