Thrust Bearing- Abnormal Wear

I noticed a lot of crankshaft end play on my 71 340. It supposedly doesn't have many miles on it since a rebuild. The spec is .002 - .007. Mine came in at .033. Attached are pictures of the thrust bearing showing that the crank was thrusting forward and chewing up the side of the thrust bearing.

Does anybody know what could cause this? Could it be that the main bearings were torqued with the crank too far forward and the end play was never checked?

Or is something else seriously wrong?