As always with a freshly repaired engine it could be potential big trouble £££'s wise, if it was repaired and then ran for a year and still going strong then fair enough but i'm always dubious when someone goes to the massive expense of rebuilding and engine then puts the car up for sale as i get the feeling someones off loading their head ache to some poor cnut who thinks he's getting a bargain....
But obviously on the other hand it could be a minter but thats the risk you take hence the low price...