It probably shouldn't be too much, but you never know what you're looking at cost-wise, until you break her open. If your rod and main journals look good, you might get away with new bearings and a re-ring. It could end up with undercut mains on the crank, a .030 overbore, etc. On the low end, I'd say you might be able to do it as cheaply as a few hundred bucks if everything is in good shape. On the high end, you could be upwards of a grand, figuring the worst case scenario.