Yeah, I fixed the crack by first welding it shut and then re-tapping the hole. I rented an arc welder from home depot and got some free cast iron sticks from one of the many (semi-illegal) 'welding' shops out in the middle of Nowhere, CA. Anyways, I'm not the best welder in the world - but it doesn't leak anymore.
Due to the urgency, I started a new thread on this exact topic:
http://forums.mustangworks.com/showt...threadid=37628