Another neat little trick is to put a 1.94 chevy valve in it. Not quite the 2.02, but gives you some fresh meat if the 1.88 is sunk a bit and some more effective area.
Interesting what gains you can make with some time and careful porting.
Wear a respirator and ear protection if you undertake this and care about your health... :)
Nice work Justin! :thumbup::headbang: