You can get a block test kit to check for exhaust gasses in the coolant bottle.
I have yet to see a cracked block from overheating.
But I have seen melted pistons from overheating.
1987 Ford mustang LX Coupe 5.0
1995 Yellow T5-RM running
1996 850 turbo
1994 N/A 5-speed wagon Purple (daughters)