Yes, in order to change a head gasket you will have to disassemble just about the entire top end. I don't think there is any way possible to get a head off without removing the intake plenum.
Also, don't just replace one head gasket. Not good to have the added compression of a new head gasket on just one side if the engine has any significant number of miles on it. You'll just blow the other side sooner. Even if the other side is not blown, replace it at the same time.
A full gasket and seal replacement set for a 5.9L V8 is about $140. Surely a V6 Felpro set will be at least a little cheaper than that.
Why don't you help your dad rebuild the engine? Surely you can give him a hand if he financed the 'ho for ya...
-Brad
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