won't turn over

[mpcalfa2]

I have a 3.7 liter mercruiser long block 190hp on my 1986 V20. Just did a tuneup, water pump gasket, thermostat, etc...and i can't get it to turn over from the throttle. Jumping it at the starter gets it to turn over but still no start. The outdrive seems to be locked in gear and i just also noticed a 1 inch crack right above the prop on the outdrive. The boat has been sitting for 3 years and my question is could this crack have anything to do with it being stuck and not shifting to neutral? Is this a death sentance for the outdrive as well? Any help would be greatly appreciated, thanks.