The water pump casting number should be 9979124. I'm not sure what yours is from, or the year. My '70 Formula has its born-with water pump that we had rebuilt by Cardone a couple years ago (they aren't offering that service any longer from what I understand). Its casting date is C110 and with a build date of 04D on the trim tag. You'll likely bust the bolt, but have you tried tightening it a little before trying to back it out? Sometimes that works, but this is an area of high corrosion, and those bolts take the brunt of the punishment. Good luck!
Dennis
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