Data: 454, Edelbrock alum heads and intake, Mobil 1, GM engine assembly lube, 200 miles on rebuild

I punctured my radiator, lost coolant in top half of engine. Refilled with water; ran engine without radiator cap, no water in exhaust, no cylinder gas in coolant, no water in oil. Put on rad cap, increased temperature and coolant pressure; got water in oil.

Planning to dis-assemble top end. Suggestions on what to look for? Gasket leaks, cracks?

Suggestions on flushing oiling system and remote oil lines/ remote oil radiator? Plan to remove oil cooler and drain it. Have old distributor set up to pre-prime oil system; thinking of using that to flush the system a few times.

Jim