Set of heads off a 1993 crown line boat. I'm assuming the heads are the same vintage. 4.3 mercruiser. The engine was running good the fall of 22 but was not winterized. The block cracked that winter. In the spring of 23 it was started and water got into the engine. Then it sat over another winter. Water was in the cylinders and rusted some of the head. They are intact with the rockers washer and nuts. Casting and sealing surfaces are good.  Springs are not broken. Some of the valves are stuck.  Thanks for looking. Next day shipping