Block out of square

I don’t have easy access to a SB block, but I checked a BB....... it’s about 8.5” from the crank c/l to the top of the bell housing flange.

If that were off .046”, it would be about .32*, which works out to .067 in/ft, so over the length of the crank it would be in the .122” neighborhood.
Still so far off nothing would fit right.

You’d really have to work at it to screw up the line bore that much.

And then there’s still no timing set that would fit.

I still believe the actual “issue” is the way the back of the block is machined, relative to the decks, main bore, cam bores.

And I think it’s always been that way.

Just get another block and start over.