Re: Montgomery Wards Sea King. 7.5hp
It seems like you are having a hard time getting some answers, and, while I don't have a professional answer to your question, you might check out this link about a Clinton Sea King:
http://www.michigan-sportsman.com/forum/showthread.php?t=235627 and read it to the end.
The motor referenced in that link is a 5 HP vs. your 7.5, but because it's a Clinton Sea King of similar vintage, there may be some useful information. Also, I have never seen a proper water discharge 'misting.' A good impeller should give a good water flow.
Here's a start for parts, and there are likely plenty of other places.
http://www.discount-marine-parts.com/ob_sea_king_5.html
And you could try this one:
http://www.laingsoutboards.com/
Once you start looking, you could find a bunch of information.