[Naja]

Right On!
Out of round cylinders will cause you to fail a leakdown test, though. In my previous post, I was referring to 2 separate and distinct problems diagnosed at the time when the serious overheating first became apparent.
Yes, I do have 1 sleeved cylinder. That block was the best of 3 blocks thoroughly tested before the engine build started.
Some of the items that you mentioned relating to the exhaust gasses were suspected as being the culprits - nothing stood out as saying, "I AM IT."
I'll remind the shop tomorrow about flushing the cooler. Stall converter is expected back Friday or Monday.
Regards,