Has anyone ever heard of these? I have an older engine (73 LeMans) and the heads are some of the weirdest I've ever seen. They have only 4 bolts holding the manifolds on, and on the outside tubes the bolts are on the inside instead of the outside flange, so I can't put headers on this motor because it would leak. This guy who builds motors and is big into Pontiac and resto told me there were special clamps for the outer edges of the header flanges to stop them from leaking, anyone ever heard of something along these lines? Really don't want to swap heads/get current heads drilled.