If you are gonna mill the head make sure you port it as well. Just milling the head cuts down on flow.
yep there is quite of bit of meat that can be taken out of the ports, especially where the bowl area flows into the port itself, get rid of all the hard edges, flow the port floor towards the valves so there aren't any drastic drop offs....
One thing else about milling the head, depending how much you mill and if you go with a flat top piston or not the sparkplug might hit the piston..... I never gave it that much thought until I assembled my clone after having .080 taken off the head and using a flat top piston..... I screwed the plug in and turned the engine over by hand a few times to see how the compression felt under a slow spin..... I pulled the plug out and the gap on the electrode was closed tight, it just barely hit the piston but it was enough to flatten the air gap.... I see places selling short plugs for this situation but thats not a real good idea as the spark will be up in the threads in the head, instead I'm gonna get some spark plug washers (indexing washers) and shim the plug up enough so it doesnt come in contact with the piston yet keep as much of the spark in the combustion chamber as possible....