Throw on a set of EQ heads if the heads really are the problem (doubt it as almost all magnum heads are cracked but never actually seen one useing water because of the crack heads). I even bought a brand new pair one time from dodge and they were cracked so I gave up paying much atention to the cracks, they would need to travel up almost 3 inches in to the ports to get water and never seen em more than about 1/2 inch. There are several points that leak water on those, timing covers, thermostats, intake manifolds, water pimp...