Hi WE have a 1966 coupe With the 3x2s.always looking for info on 66 GTO.Thanks Mike

Hi my name is Ken and I am new to the group. I am restoring a 66 GTO 389, tri-power, four speed. I am a backyard mechanic and have a question on the intake manifold. it has a recessed 1 1/8" dia. hole water passage through the timing case cover. In the new gasket kit there is a 1 1/16: O.D. X 1/2" center hole. This is a very sloppy fit. The last person who replaced this seal used blue permatex encaseing the seal which was off center and he used a knife to trim the I.D. Parts houses have no answer for this. What is the correct leak free installation? If it is a larger seal where can I get one? Thanks Ken