The design of the 1967 Ram Air exhaust manifold will not allow a bolt to go in. It seems like there should be a stud from the head to this one opening (see picture) as I can't see how a bolt goes in other than pre-mount the stud and then put on a nut. I can't find anything about a stud for the ram air exhaust to head. If you happen to know, please reach out. Thanks.