Went through that a couple years ago with "The best Mopar guy in Chicago".

1. Put one rod/piston into block-Piston stuck above deck .250". Guy ordered wrong pistons. Took 4 weeks to get right pistons.

2. Decked the block with the alignment dowels still in the block. Had to drill them out.

3. Went to install cam- Bearings so tight cam would not go in. (He had the cam specifically so he could fit the bearings)

Trust no one.