New parts in machined block.
To this post, I would have no problem putting in new parts the sizes the machienest stated he did work for. The coviot is make sure his work is correct and sizes he states are correct.
cas in point had work domne on one of my 400SBCs and crank was stated as a 10-10 under.
He gave me bearings for a 10-10 crank, and I did not check.
After assembeling 3 Main caps (Torque could not spin crank. Checked and hasd 20-20 crank. So if the machine work is correctly sized, makes no difference if you put different parts in as long as sized for that motor.
Always check clearences on assembely.