[blykins]

In my mind, anything that's worth doing (especially with high dollar engines) is worth doing right.

That includes checking every measurement: every bearing clearance, every piston/cylinder clearance, putting the block decks where you want them to get a parallel/square deck, etc, etc. There are a myriad of steps to ensure an engine is "perfect".

It also includes checking the rotating assembly balance. You can't mismatch aftermarket parts without doing it. Aftermarket crankshafts can be used with factory rods/pistons or aftermarket rods/pistons and every combination will have a different bobweight.

All of this contributes to a smooth running, solid engine...

Anything not checked could contribute to an engine failure.

Anyone can put an engine together....only a few are engine builders.