[Gach]

Let me add this. X-ray vision? All an ultrasonic inspection will do is confirm there is enough material in the primary thrust face to machine out. Blocks corrode internally; they also suffer from coolant erosion and cavitation. I know of two ‘ blocks that had primary thrust face cylinder walls that were less than .090 thick. The MINIMUM primary thrust face cylinder wall SHOULD be .150-.180. Align honing simply insures that the main saddle alignment is correct. It’s a simple process that removes a modicum of material from the main caps and the main saddle. At most, .003 005out of the caps and .001-.003 out of the main saddle. Iron DOES distort over forty years of heating and cooling cycles. Have them check the cam bore alignment as well.

I’m sure you’ve already made a decision, but the above just something to think about.