I'm rebuilding a 1981 cj5 with a 258 and have been looking into getting a new exhaust manifold. The more I read about them, the more I realize there may be more to it than just buying one online. Some forums talk about some special emissions manifolds and "plugging holes". Others say that the stock intake manifold won't work with a newer exhaust manifold. The old exhaust manifold was to far gone to reuse, and the intake manifold is in good shape. Basically, I'm asking if any exhaust manifold I buy online for a 1981 cj5 will work fine or if I need to find something else?