yep, std cams are good for much more power then you will ever see from your baby turbo, and give you massive torque, which makes a real nice road car.

as a general rule for cams, the wilder you go, you gain top end bhp, but loose torque on the way....add this to the fact your turbo makes its power low down on a .48, it wouldnt make much gain imo

as for piston /valve pockets, it depends how much has been skimmed off head/block, what head gasket thickness, and how they are dialled in.....when i spoke to stu about this, he said he has seen std pistons clear a bd14.....iirc