Well when trying to cut the head or block a whole lot on these engines the exhaust valve is one thing to watch out for. It has a flat valve angle, and the valve head is almost level with the heads deck surface. You might consider also checking the piston to valve clearance as you disassemble the engine as well, just so you can establish some guidelines now, instead of going to far to fast, and then having to back pedal, especially if you are considering a cam swap to a more aggressive profile on top of excess block and head milling.
