I've got a 427 sideoiler block that went .060", made 675 HP, and is still running fine.  Its one of the dyno mules I described in my book, and the sonic numbers were scary, but the engine has given me no trouble, even after hundreds of dyno pulls.  $1800 is a decent price, and probably worth the trip.  If you decide to go, make sure you bring some way to measure the bore to make sure it is only .030" over, check for cracks on the deck of the block and in the main cap bolt holes, and imperfections in the bore that may require a big overbore.  You can sleeve the blocks if necessary, but you can't sleeve two adjacent cylinders, because they will crack between the two sleeves at the deck, and you will lose coolant there.  
If you buy it, figure on getting it sonic checked so that you know what you've got.