Didn't you just get the head rebuilt? If so, I would work with what you have now. More than likely you will have to bore it, more than likely your crank is OK. Probably pay to buy an engine kit with the cam, lifters and timing chain as well as pistons, rings, bearings and gaskets. I don't know what a kit is now, and also don't know what machine work costs in your neck of the woods but I bet it would be far cheaper to rebuild what you have, plus from what I have seen from some rebuilders you will have a better engine.
