Sorry my mistake.

Actual torque is 282 nm between 3500 and 4000RPM.

HP at flywheel is 168HP at 109kmph

I found out that:

HP at the flywheel is -

HP at the rear wheels plus one third.

ie. 126 + 42 = 168HP

So my Z has good torque and power where I need it most for roadwork and would need a different cam for serious competition work.

33% HP drop, are you sure? That seems a lot