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Make sure to service the raw water pump

You have to replace the impeller as step 1 of resurrection of any outboard. So service the raw water pump

Your issue is in your post. Compression 90 psi or below is a core motor to be properly rebuilt. Have the block bored/honed, get new pistons and rings

Until you get a WOT run, you don't have a starting point. When you get the motor broken in. Change the oil and then go for a WOT run. From there you can dial in the prop and not before

Sculling crews can get almost 15mph

You're looking for a 55 year old motor that was designed to last 15?

Yes, you can buy GM parts from GM

With the same 4hp? The same speed. Until you get enough HP to get the boat in plane, you are at displacement speed

No such animal as marine oil SAE 30 is SAE 30. Go to Walmart, tractor supply, Napa, carquest, etc.

Most IO boats are fiberglass and neglected and look good long after they are rotted to the point of being unsafe

96-97

Welcome aboard. Get a manual for the engine and drive from the respective companies Most boat information is generic. What information are you looking for? If you are looking for a manual for the boat, keep in mind there are no manuals for the boat

Agree with above Canvas must have waterproofing reapplied every 6-12 months (even sunbrella). 303 fabric protector

Port side will have displacement cast in the motor. Casting numbers on block may be easier to get to

You're going to have to measure.

That is after the factory elbows.

Nope, not standard

I would helicoil it

They don't make manifolds or elbows. They pickup after the elbows

If your looking for any of the EFI components. They are all NLA. Ford quit support years ago