Hmmm, did you have lots of oil before changing the head gasket? Is the oil flow cut off completely? (probably the head gasket is on backwards)
Is there much less oil flow? (possibly a chunck of crud is the passage) Did you mill the head significantly?
The stuff about the bolts is in Spykes "Head Question" thread. BUT you can't see the pictures because my web server is down for "maintainence" until last Saturday - Since it doesn't work Saturday must mean Wednesday in Dilbert speak.
Anyway, check the Head Question thread in a couple of days.
Good Luck