I took a look at Houston's Craigslist and the prices are all over the place for the XC90. Some of them are trashed and with half the mileage as yours. But, for $3K you could pick up a nice looking 2005 with unknown mileage:
http://houston.craigslist.org/cto/5446335394.html
A replacment head gasket will probably charge out at around $1200, fixing the valves on #4 and #5. The other readings of 130 are a bit low, but I assume that the engine was cold and it was a dry reading.
Actually, you did get your money's worth from this car, if that is any consolation. If you have records of what has been replaced and maintained, that would be a plus to someone who wants to buy and repair the car. Odds are that that would be slim to none given the mileage and the number of XC90s on the market.
If you decide to run the engine, please pull the electrical connector for the fuel injector on #4. No need to pour fuel into the crank case.
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Keeping it running is better than buying new
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