I have, in the car, a running flathead with 8CM heads. The car 99% all there, was originally bought as a project car but I am leaving the state and need to liquidate. I can't 100% confirm it is a Mercury, but the 8CM heads seem like they have been on there for the life of the engine. The engine will start and the car will move under its own power and can be loaded onto a flatbed for transport. I have changed the oil, tuned it, the basics to make sure it runs. To the best of my knowledge, There are no cracks. The oil is black and the antifreeze is green and it doesn't look like there is contamination in either fluid. It still makes oil pressure just fine, but the engine does smoke. Cash only. Local pickup only.I have title from Kansas, I believe, but I never transferred it into my own name. I will post pics in a day or so.