mines got no running problems as such!just weeping down the block,have u checked for this on yours?under the exhaust manifold?tbh if i had the chance i would not use this type of gasket due to the cost!plus u can only use these due to the machining in the block to except the fire rings!u say u want to rebuild yours?if that the case go for a 200 block and rebuild one of them!there are some in the parts for sale section!