If you are a tourist, you can import it for a year. The US is NOT a signator of the Carnet system so while it won't hurt, a carnet is only good for you if your going to travel to Canada, Mexico and/or points further south.
What you WILL need is insurance. You need to find a good friend in the US that will let you "live" at their address, register it there (its a state issue, not a federal one) and then insure it.
When lived in Norfolk, VA I had a mate who would ship his truck over and register it at my house. That way he had VA plates and insurance while he was in the states for 364 days!
Btw, if the truck is 25 years old then there is no worries at all. Just pay the customs and duty on your 500$ beat up old defender ;-)
Good luck!
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