[era565]

you have an exhaust manifold leak at the headers because your heads have 2 sets of bolt patterns, and you are only using 1 set. Get a set of gaskets from Doug at ERA that are special with only 2 holes per port, and you may need to belt sand each of your pipe flanges to get them flat. Use plugs with a compression gasket ring. you may have cross fire on 2 parralel plug wires--seperate them