90 over 318 Head Gasket info needed !!

prorac1 said
From what I understand earlier 318 blocks can be sonic checked for wall thickness, and often bored to a 4.00 bore.

I have the following
68
70
(2) 1974 blocks
They are cheap to purchase and works for me .
My recent purchase/ project 66 Dart has a nice 70 340 in it but Im trying this format first with the 318 blocks and my custom crank with 3.20 stroke.