Tech,
We don't have a precision square at the shop and the one I have won't work for checking the block. It's not big enough, I think it's only like a 6" square. We do however have a large granite surface plate but I doubt they will let me put the block up there to check square with a height gage. But if so,, I could also check cam bore to crank bore center line. While I can still get that dimension, it's just a tad tougher using mic's and calipers. But I can get real close using just those tools.
HotRodN