unless it got pretty damn hot, i wouldnt worry too much about the head being cracked IMO. Head gasket would go first and like i mentioned, you'd more than likely be seeing lots of white smoke.
you could pull the plugs and take a look also. if they're getting water, they'll usually have a lot of crud on them.
'90 YJ, ford 8.8, SOA, lincoln front, aussie rear, 4.88s, swampers.