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Hello, I'm Tan. Welcome to JustAnswer. I'm reviewing your question and will reply momentarily.
Have you tried to turn the engine over with the spark plugs out?
What does the engine oil look like? If all cylinders are clean something else is causing the problem. Have you removed all the belts and tried turning the engine?
What does the transmission fluid look like?
I can't recommend anyone in San Diego as I live in Az.
Your best bet is to call around the Marinas and ask if they have a builder.
Now I can give you a company that we use online.
Can you get me the model year of the engine please?
Before you go buying a new engine you need to try to determine what the problem is. You could replace the engine and still have the problem. If the starter is stuck engaged it will keep engine from turning, seized transmission.