Can a 273 crank be balanced to 340 specs ?

And your buddy didn't prelube because????????????

How does your buddy know the engine wasn't properly cleaned? Lots of questions that are going to be hard to answer.
He said he went to the machine shop with the owner, they had the shop guys pull the parts from the truck and they immediately started assembling it.
No bore brushes through the oil galleries.
No hot tank.
No jet wash.
He asked why they didn't use Plastigage. They said they machine the journals to fit so there was no need to measure anything.
My friend owns a Carburetor rebuild and repair shop and is quite skilled at THAT....Engines themselves are another matter. He is experiencing a steep learning curve here though.
The engine sitting at his shop for months surely collected some airborne dust, right? How much is necessary to contaminate an engine enough to lead to rod and main bearing carnage?
He said the guy assembled the engine using an air powered impact. When he told me that I was shocked. He simply didn't know that the assembler absolutely should NOT have done that! After some conversation, my friend started piecing things together that didn't seem unusual to him at first.
A month ago, he took the engine to a different shop. The man there put a digital torque wrench on a main cap and it cracked loose at over 131 ft/lbs. What is the spec on mains...85 ft/lbs ???
Obviously, the shop was to blame but how do you make a case on it to get money back?