Interesting to see this fail at OEM power levels. The only other oil pump gear failure that I am aware of being documented on the forum is a spitfire's build thread, that shattered somewhere around 700hp. I don't recall the rev limit on the car but I believe he did head work as well. Link below.
http://www.ft86club.com/forums/showp...&postcount=250
I feel like this would just be a mad mis-shift or extremely poor luck with a defect in manufacturing... Either way, good luck OP.