DO NOT drill extra holes into head gaskets... NEVER... unless you want to increase engine temperatures and create hot-spots in the block/heads (then monitor it???)... they are controllers of flow volume and direction. The extra casting holes (and sizes) in blocks/heads are there primarily to remove sand during the casting process.

Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!