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A bad leak down on one cylinder, in a car that has been sitting isn't that big a deal. In the airplane world Lycoming says as long as the leak isn't from the valves, fly it 10 hours and recheck. Letting these cars sit is the worst thing you can do to them, drive them often and hard. Had some miracle stories of my own involving Brad Penn, and hard driving. If the car is up to snuff, negotiate with the buyer and enjoy the drive home. Change to Brad Penn drive it hard and retest, up to 3-4 or more, as long as its running good, who cares? Missing and sputtering is another story, budget for a drop and toss a used good head, cylinder and piston/ring combo and call it good.