[Trackrash]

My last motor had 90mm Mahle piston and cylinders based on my '71 T motor. Made it a 2,5 l with E cams and Webers. Head slightly ported, 35mm I and E. Pulled 180 to 190 HP. Even with the 8,4 to 1 CR it had it was a still very sweet running motor. BTW the long block is for sale.

Your problem is you have cast iron cylinders. They can be bored, but really they are not the best for a true high performance motor.

If it was me, I would find a set of used 90mm barrels and have them bored to 92 and get some JEs at around 9.5 to 1 to match.

You will have to machine the case and heads for anything larger than, I think, an 84 bore.

If you really want to take it to the next level consider going to a 70mm crank.

Do a search here, there are a couple of threads on building 2,2s.