Generally speaking, it's a pain in the a$$ to get to anything under the hood of a modern day vehicle. That being said, unless there's something extra special about the Northstar engine that I don't know about (and that's very possible) I really can't see anything super difficult about changing a head gasket. If the only damage is just a blown head gasket, and the rest of the engine is ok and not damaged (warped heads, etc.) I'd think that repairing it would be a good idea......especially if it's nearly mint 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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