[njsteve]

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I woildnt worry about them blowing up I have seen people driving around with much worse. They hold air just fine. They would be perfect for judging a survivor car. The camera really magnifies the cracking. Strange they only cracked on the inside perfect on the outside with about 80% of thread left

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They'd be fine for display and judging but you're putting your life and your car in danger if you drive on them for any long distances. The general rule is don't drive on tires older than 7 years. - I know that from experience after having a 10 year old tire blow out - and it had 99% of it's tread depth left. After a certain amount of time the rubber dries out and becomes unstable.

BTW, those cracks are most likely due to ozone damage from being stored. If you have to store tires, never store them near any electrical equipment like heating/air conditioning systems that have running motors. The trace amounts of ozone that is created by the electrical fields destroys rubber products.