1979 Rabbit, Blown Head Gasket Help
 

I was looking at a rabbit for cheap and it seems like everything is in perfect condition but it has a blown head gasket. I am not really a car person so i dont know anything about that and was wondering how much it would cost to fix it. If it is not a very hard fix i have a friend that is into cars and has done a lot of work to his cars and so if it is an easy fix he could probably do it, then i would just need the cost of the parts. Any help?