Which heads?

Just dropped off the 360 block and crank at the machine shop. It’s a good thing I decided to pull it apart, although it had all new parts in it I found a broken 3/8 drill bit in the oil pan. There was small amounts of metal that chewed up the bearings. I don’t even know how a drill bit gets into the oil pan haha. Machinest is ordering new KB Pistons rings bearings and gasket for me. Also gonna balance rotating assembly. Gonna drop the heads off for springs and good performance valve job whatever that means. I’m running the summit 6901 cam. What kind of power do you think this little engine will make?