Overhauled om 352. New sleeves fitted professionaly, STD pistons with New ringset, New oilpump and bearings. Starts reasonably easy when cold and very easy when hot. Problem it SMOKES grey white and not revving up to top. Misfires and shaky, Exhaust ports 4,5,6 oily with manifold removed and engine running. Does this engine use valve stem seals? Injector pump and injectors tested and found OK. Spill timing OK.