340 Block Bored to 4.160????? Help

Killer6 said
You would also need to run a Fel-Pro 1008 gasket w/a 4.180 bore if indeed that is the bore.............dumb question, but You didn't install the head gaskets reversed &
block the cooling passages did You ?...........................

Look at the siamese bores you would need to get a true 4.160 bore , with the sleeve walls OD probably needing to be milled flat so they fit together....if this 4.180 pic is to scale....