1968 350 HO, both heads have the small square hole in the center of the heads which face the intake. The manifold is a 9790140 which had a small hole in the driver side of the intake, facing the head (exact match to head). The pass side of the intake has a large/rectangle hole face a small hole on the head.

Which intake gaskets should I use? The driver side gasket's small hole slightly covers the top of the small holes of intake and head. Should I modify the gasket?

Thanks for the help