Yes i will try to get the combustion chambers modified to have a higher cc. Spoke to a garage who say they add a metal plate to the bottom of the head for 75 quid a head, probally will be cheaper than getting the combustion cahmber modified. I want to keep the pistons untouched for two reasons:
More meat means stronger pistons
It will save me from having to strip the bottom end.

Having said that i can get the heads ported at the same time.

What boost will i be able to expext at 8 to 1? I`m hoping for 15 - 22psi, should be more than enough power as it will have the mt75 4x4 box on it.

Thanks
Darren