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We started using ultra gray rtv on the dyno engines and then on the race car headers. It works really well for cast iron manifolds and there’s less chance of cracking a manifold than when using a gasket.
I had a buddy with a fox mustang with the same problem. I cut up his headers and reworked them raising the tubes 2-1/2". If you have a buddy with some skills, maybe he'll help you out.