My friend who works at the JY called me to come look at a mustang engine, said someone had looked at it and said it was a Corba engine from a 93 model, I noticed it had the black steel valve covers, we pulled one of the covers and sure enough it had crane roller rockers. The engine would need a rebuild I would assume since a few of the freeze out plugs are gone. Are the heads themselves worth anything?? I have a prefectly good bottom end ready to go, trying to piece some cheap items together for my next project