Tracy,
I picked up the resurfaced assembly today, and the machinist told me 
that one end to the other of the gear box contact surface was .027 off.
I removed the original automatic transmission gear box from the 
bellhousing and replaced it with my new mounting plate. So everything 
was centered as the original transmission gear box. All the mounting 
bolt holes were match drilled. With the extra long shaft, .027  will 
give quite difference at both ends of the shaft.
I don't see anything else to check?
Buly

 

It may be that I am not seeing this clearly, but, I put a magnetic based dial indicator on the counterweight and run it on the pilot hole in the plate or bell housing, while turning the crank.

 

You can get the concentricity down under .010" just by tapping the plate or bellhousing around without the alignment dowels in place.

 

 

Lynn E. Hanover