Possibility that the intake ports on that side are not sealed up either. The problem could be that the manifold was cinched down on the opposite side and the side with the gap couldn't settle in place. I'd take everything loose, apply some Ultra Gray on both sides of the gasket around the water ports, and then set it in place evenly.
Take a look at how the threaded holes in the heads align with the holes in the intake. they should be centered in the manifold holes. If you have problems with the holes being way off (like the threaded hole appears at the very top of the manifold bolt hole, then the manifold surfaces should really be milled to bring everything in line. But just try centering the manifold to start and you could be OK.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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