Mark,
It is possible that the new bush is now out of shape (oval) or the bore (surface) is damaged because of the crankshaft journal failure. I would be surprised if it wasn't.
The required clearance between bush and journal is 0.0015", with 0.003" being the wear limit. I have dismantled running engines with a lot more clearance (up to 0.008"), but oil pressure will be lost at the greater clearances, and the risk of throwing a rod is increased.
If you have enough material on the crankshaft journal, I would be tempted to get the machinist to clean up the bore (take a lick out) so that you know it is concentric, and has a very fine finish. THEN grind the crank to 0.0015" clearance.
Richard