To be accurate you need to check the distance in the 4 corner cylinders to see if the block is even height on both sides---------and also if its 45* from crank which equals 90* from rt to lt side

Chev sb typically are tilted a little from front to back in opposite directions------It takes quite a bit of high dollar tooling to correct a block to the center lines of the crankshaft bore and the camshaft core hole