If it was machined before or after the lug races were broached I don't know, but my best guess the bridge was cut flat using the "looks good" approach after a few shots of Jack Daniels.
If you look at the right side of the bridge the flat machined for bolt release clearance and the lug races you'll see they're parallel to each other and the best I can tell from your pic the races appear to be straight.
One other question, do the holes for the mount screws line up now? If the holes line up the best you can do, bed the the action to the mount otherwise hang it on the wall or sell it to someone you don't like.
Bill
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