[BRENT in 10-uh-C]

If you had to stake all your worldly possessions on getting this answer correct, I am asking this question regarding overheating due to cylinder bores that are too thin. What would you say the absolute minimum wall thickness an A-6015 Model-A Cylinder Block should be bored/worn/eroded/whatever to that you would GUARANTEE that a rebuilt engine would not overheat as a direct result of too thin of cylinder walls?

This is not a trick question, but a sincere question regarding giving someone sincere advice about. I honestly am not looking for 'He Said/She Said' answers about someone who got away with...., -but instead I want to discuss Ford's engineer's design tolerances, and what we would feel comfortable in giving sincere advice about. Thoughts??