Gold Lifetime Member
Join Date: Dec 1999
Location: Yorkville, Illinois USA
A little water shouldn't cause any permanent damage, just change the oil and filter several times after you get it running again. Let it idle for 10 minutes and change the oil, repeat as required. If the oil looks gray or milky, do it again. And fix the overheating! It's possible that the head gasket problem caused the overheating, or the other way around. For a 454, you want a 23", 3 or 4 core radiator, and a real fan, with a shroud.