Cam advice for more torque from 340

As a point of reference, the shallow flat area in the heads is around .090" deep on stock castings. With that step being about .030" high, that seems right for the KB243's, but I don't have any to doublecheck for you.
My engine is on a stand right now. If I rotate it over will there be a way for me to see the bottom of the piston? If so I can give it a go since the oil pan is off. I would still need to remove the lifters before turning it over then the metal shield on the bottom.