Ive had 8 or 10 kb blocks over the years and still have 5..Not a single one of them have the lifter botes located properly. You can get different cam timing readings from one cylinder to another. Not the end of the world, and not radically different, just different. Also not isolated to the old KB, most blocks are like that even "cnc" machined. I think the problem begins with using the cam bore as the alignment for swinging the block from one bank to the other with it being held on the mains. Lots of distance in those swings, and problems relying on that to create inaccuracies.(also is not cam causing the reading changes)

I'm confident the new blocks won't suffer from these maladies. Would be a great improvement for KB