Part 3 of my 79 Firebird build. I FOUND A PROBLEM

This is part 3 of LS swapping my 79 Pontiac Firebird and unfortunately the head gasket I used was not compatible with the heads I am using and are leaking antifreeze. So after 3 months of putting my car together I now get to tear the heads off and get different gaskets to fix my leak. The gasket was supposed to have fit my engine but was listed wrong and does not work with the heads that I have. The 1999 862 castings have a notch in the head surface that makes the gasket not seal the coolant so I have ordered new gaskets and bolts and now have to replace both gaskets with a different head gasket made by Mahle for this exact head casting. The OE gasket was a Composite type gasket for 99 and the later style MLS gaskets don't work with the older heads but Mahle made a MLS gasket for these heads so that is what I ordered.