I acquired a complete F54 block P79 1983 280zx motor. It did have a blown head gasket and here is my question. After removing the top end and looking at the existing head gasket and the coolant passageways. It seems to me that the wrong head gasket might have been used by previous owner or mechanic. Some of the openings for coolant flow were blocked off by this head gasket. Is this normal? I'll post a picture soon but on the gasket itself you can see where coolant was going to the gasket but not through to the other side. Has anyone else noticed this?