A while back I acquired an FE from a '75 4x4. I was told it was a 390, but coming from a 4x4, I assumed it was a 360. I took posession of the engine Tuesday, and this morning I was darned glad to see a 3U casting mark on the crankshaft. I really didn't want another 360 rotating assembly laying around. It was running when removed, but it's got some surface rust in some of the cylinders now. Well worth rebuilding.