I blew the head gasket in my 1989 300SE. Rebuilt the head and installed. Re-installing the intake manifold and all bolts align except for the two on the ends. Doesn't make sense to me since all others line up properly. I probed in the bolt space by #6 and it seems like the head is slightly in the way. How is this possible? Any ideas as to overcome? My first rodeo here, so any suggestions would be very helpful since I am beyond frustrated.