[daveymc29]

I think it may be any of the choices you give. I would remove the head and pan and see what I have before I started throwing parts at something I am unfamiliar with. Clean everything carefully and look for cracks, The ones I have seen are usually around the valves and run toward the cylinders, Also under the water pump boss and at the rear of the engine above where the accelerator bolt to the block. But they can be almost anywhere and some are very difficult to see. Hope for a blown headgasket. Cheapest fix.