Gem555, I bought an A-4 that was seized while inside an E35 MkII. It took a week to get it running again and it did not fail me once in 34 years and is now serving the new owner.
Not a dis on you however if you settled down and learned to do a couple of diagnostics and possibly post a pic of the engine so it's condition can be seen.
You have seen all sorts of suggestions and we have seen little in actual information. These checks are very simple and once performed an understanding of the beastie will manifest and the use can begin.
I feel if you spent the time you are wasting on mechanics trying to understand the basics you would be up and running.
Get the BOOK, start from scratch and you will be way ahead financially and on the water with "self confidence" one of the greatest values afloat!
The forum is about assistance and learning because it can work.
I suggest another go at it
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Dave Neptune