the motors will never be what the they were. rebuilds ect time MONEY with no guarantees, corrosion on connections sensors computers. not to mention all the submerged wiring , switches, batteries accessories like trim tab motors.
its a big job...
if the motors were removed from the water and not cleared run up immediately they will be junk forever pitting on the crank and other internal components starts as soon as air hits. even if its to be rebuilt if cleared properly and the run up with fogging oil or something similar the oil coats the metal preventing corrosion and the clean engines oil helps slow the process down on internal components. in fact in some cases its better to leave the motor under water till a shop can get to it as it won't corrode nearly as fast. to replace the two mains would be a tough pill to swallow. i personally wouldn't get into a project like that it could just hemorrhage money and time.