Chriscraft w/ Mercruiser I/O wont raise completely

I would say drill a hole in the center of the plug and use a easy out to remove it. Here is a link with that and other ideas.
https://forum.supraboats.com/showthread.php?834-Exhaust-manifold-drain-plug-destroyed-removal

https://forums.iboats.com/forum/engine-repair-and-maintenance/mercruiser-i-o-inboard-engines-outdrives/643893-broke-exhaust-manifold-drain-plug

I would look up a Websearch for the brand of motor and the year and engine size. Marine engines have different camshafts and timing is different than on an auto engine. You would look up Mercruiser if it is an inboard/outboard outdrive and has Mercruiser emblems. Same for Volvo or OMC embled outdrives. Ford makes the basic block but the specs go by outdrive makers.

This is because the gearing in the outdrives make a difference in what the engine needs to do.

Sounds like a problem with the outboard drive.

You have this posted in car and truck category, please re-post in boats.

Have system pressure tested. You may have too much water in the radiator to be put in storage.

Running on a stand is not the same as running under power...In the water, you are essentially running on a dynomometer (dyno is a big water brake) If you can prove that the module isn't putting in enough advance, it would be doing the same thing that I mentioned with the damper, only for a different reason. So...you're likely on the right track. (rather have a points setup out on the water...anything goes wrong, you fix it without a tow!!!!)
Good luck

Alpha One is the out drive, what engine do you have? Remove the distributor cap and verify if your ignition is electronic or contact points. Either way, I recommend going with a Pertronix electronic ignition. This module is a simple drop in installation and will eliminate a major portion of your troubleshooting. Pertronix also has a high output coil to accompany their ignition, I recommend you install both as a set.
FYI, water in the cylinders is not good. Especially if it sat for 5-6 years rusting the rings and cylinder walls. Was this boat running when it was parked and do you know the history?
Nick

chances are the prop has an unbalance condition...You can also check it for excessive runnout by simply referencing it against something and turning it. all blades should remain at the same distance from reference point as you turn it. You can do this to check the shaft as well.

Just an idea but your water pump is only rubber and setting for the winter it didnt stick to the sides of where it pumps did it.. sometimes these pumps are tempermental.. you might check your water pump again making sure its pumping right.. is it peeing out the sides good like it is suppose to ? also if its getting hot on top it makes me think the pump is not doing its job right maybe just pumping some.. not enough? just a thought .. thanks Jerry

There is a 'trailer' or some such labeled switch (usually on the side of the throttle) which you need to push in order for the motor to go all the way up. It stops at 1/3 because it thinks it's in the water. If you push that switch with no better result, then a related wire may be broken or disconnected.