What would be the least aceptable compression reading in a 390 CID Ford

engine in a 1965 Ford Thunderbird? I'm looking at buying this car,but i'm wandering why it's so cheap. I've driven it and it seems to run well.Every thing works on it,but i did a compression test on it and more than half of the cylinders read around 80. Am i looking to rebuild the engine in the near future?
 
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