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Get an OEM carb. The internal passages in the chineseum carb are most likely not drilled correctly

The difference is 20 years after its too rotten to use will the are ve hollow

If you are getting 3-5 psi at the carb with the motor at WOT under load, there is no restrictions in the fuel inlet

Your motor is a left hand rotation motor

Your carb needs work as the secondary jets are probably plugged

Inspect the insides of the rubber hoses When you ran out of water, your exhaust temp went from 210F (water and exhaust) to 1100+ ( exhaust only) The rubber hoses are good to 250 then they burn

There is no manual. The customer service at cruisers is top notch. They can send you a PDF copy of the brochure What information are you looking for

Paying for shop labor at $100/hr adds up fast Do the work yourself and you are in the $3500-$5000 range Resin price is up 300% over pre-covid costs, so that isnt helping

Was the new carb an Amazon china special?

If only Mercruiser had a manual...... Wait.....they do http://publications.brunswick.com/

I use loctite thread sealant on NPT fittings. Nothing on the SAE inverted flare

There are no "chips" the motor is already putting out a fair amount of power. To put out more you need to go bigger with the motor, change cam, or you can add a blower..... All will require the use of MEFI burn and remap the ECM Drop to F4 props

20 volt drill will pull up to 15 amps max. A 12 volt boat lift motor on a 10k lift will pull well over 100 amps when loaded

Still don't understand why a mechanic would suggest a new carb over a $20 carb kit Take it back the the mechanic and have him make it right since he didn't finish the job

You can leave it there until well after the fuel goes bad

That info is on the Holley site https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://documents.holley.com/techlibrary_carb_numerical_listing.pdf&ved=2ahUKEwj2u8XH1tqAAxXMSTABHaYbB6cQFnoECB0QAQ&usg=AOvVaw1UziVPwG2-N82hs9EiLZMZ

Get a tach. That is important

All of which can be fixed for less than $30. Then again, I have $500 worth of Holley parts and gaskets in my tuning kit

What butchering? Other than coming with a fuel feed and most likely needing to be gone thru from sitting. I don't see any "butchering"

Per post #1 He overheated due to failed impeller and now the motor idles ok, however the motor won't rev under load