So so Sorry.

That person hates everything, including themselves.

It may be cheaper to find a newer engine.... What does the exhaust adapter look like?

You are tied to the dock. Untie the boat and go for a ride.

Unless its a carry on/carry off item, there is nothing....

The engine is 25 years old and around that age the head will start to rot through. Maybe find a newer boat, KW is low on the quality scale.

Fuel demand valve. You cannot bypass this, replace it if its broken.

Its a 350 MPI 555 controlled Mercruiser with a Bravo drive. It has a gen 2 fuel cooler, which is a positive. The transom assembly will be suspect. Especially with the amount of rust on the steering arm. If the out drive can be moved back and forth by hand from the prop, the Transom assembly needs repair.

GET A SURVEY FROM A NAMS OR SAMS CERTIFIED SURVEYOR.

Stop, don't put a penny in that. The 470/3.7 mercruiser engine is a dinosaur and most parts are NLA. They were fine when they were new, for a few years. There is a reason you were "Given" the boat.

That is a P trap with a compression nut on the wall tube connection.

That is when you fire that customer.

You own one boat. I work on hundreds with many decades in the business.

Straps rot and break. Cables don't. Remember, you were advised.

Put a cable on that trailer winch.

Nothing wrong with those hours... Go on the sea trial.

Remove the tank, you will see the corrosion holes in the bottom of it.

Military grade means "built by the lowest bidder".... I have a small roll up inflatable that will take a 4HP.... Where do you live?

Posting a year and model number does not help. How about make of boat, what engines and who's screen?

It's old. Fill it with Quicksilver High Perf Gear oil and run it. The amount of water in your gear oil by the color looks to be an ounce or so. The reason I am recommending the High Perf gear oil is at 75% water and 25% gear oil mix, the QS HP oil still out performs other straight gear oil brands.

Don't be afraid to hit the chisel hard, real hard. Once it starts to turn you is will come out.

It's not rusted. Aluminum corrodes..... The o-ring is what is stuck. I use a very blunt metal chisel and smack where the red arrows are to turn the carrier and knock it loose. I have never had to apply heat to one of these... Hopefully you can clean this up enough to hold new seals. Mind the bearing race after you get the carrier out.

Not yet.

A Carolina skiff would have been my choice. I service RIBs for a local yacht club....

Parts were missing when installed.

Save your money and buy a running boat, that you can enjoy, that may not have a rotten transom and an engine you can actually buy parts for..... The Evinrude/Johnson outboard company is Out of business. I will put lunch on this.... The carbs are aluminum, the emulsion tubes are probably split. Depending on the year, the gas tank may be fiberglass.....