First make sure they are flat with a straight edge. If they are o.k. scuff them up a little with some coarse sand paper. Then clean with lac. thinner. Don't use any gaskets! Put a bead of Permatex Ultra Black #598B on the manifold side and a thin layer on the clean side of the head! Studs work a little better than bolts! Install manifolds and don't over tighten. Let dry. Start engine and let it warm up then let it cool all the way down and then retighten again not to tight. Make sure timing is correct and engine is not running too lean. This should work for you. Good luck. Neil