11:1 cr
Mild ported/flowed head
Racing puma cams with optimised exhaust cam timing and mapped Vvt inlet
Stainless tubular exhaust manifold
42mm tapered Gsxr throttle bodies
Rod bolts

This gave 182 bhp at 7000rpm
It would not give a single bhp more!
The headwork is important. The head is good but needs work!
Racing puma spec cams are good but slightly bigger will help if looking for more power than this as they're about at the limit.
Skimming the head 27thou will take it from 10.2cr iirc to 11.0:1 cr
May help you. This is a genuine 180bhp engine you will struggle for more without going more ports built bottom end, cams and springs.