Anybody break a stock block, if so at what hp?

I dont know how heavy your car is or how much it was leaning out but 500 hp will net you 10.90 in a 32-300 # car. If your car is 579 hp you should be able to run at least 127 and mid 10's. My car is around 600 hp at around 3150#
Mick
My car weighs #3580-3600 with me in it