Again in a week and for less than a grand you can know for sure if it is the block. Even if you sonic test the block you still won't know if that is why it is over heating. You hopefully will find out if there is blockage in the water jackets or if you need to re-sleeve.

The car is stock and he has a ton invested to make it that way. It is a beautiful car so rigging in a 26 inch isn't an option.

If you go back and look at the threads every conceivable option to help him find out the answer to this overheating problem has been suggested. Whether or not he has explored them all only he knows. That is why he is at the point of questioning "core shift".