...I had another engine builder take the motor apart and check all the bearings clearances. He rubbed the cylinders and line honed the block again.
Why did you have this done?
Why not back to the original builder?
Who did the first dyno run?
Who did the second dyno run?
Once the oil pressure is fixed, what is wrong with this motor? And exactly what problem are you solving by selling this motor and starting over? A perceived piston rock problem? If you do another motor, will you use the 3rd builder that tells you have 30th piston to wall, or will you get a 4th engine builder?