I'd be pulling the head no matter what. The valve could have dropped and the piston hit it. The only way to know for sure if there is any other damage is to pull the head.
My .02 cents!
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD