Freeze plug pushed out

Put in a brand new radiator with the rebuild. The overheating was caused from my dad putting that copper radiator stop leak in a couple times when my sister drove it. Completely plugged the water jackets on the heads and block. But the guy chiseled all the passages clean on the heads, and we cleared all the ones on the block, new water pump as well. The only thing we used over without being checked or replaced was the rods and and pistons. Which had all new rings and bearings put in. It's got to be a head to block thing, or still burning the assembly lube out. Which I know its not likely to be the assembly lube burning out and more likely to be the block deck being warped.