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Yes, the drive must come off No, you can't patch

Was it the pump or the motor. Usually the motor is what goes

Clean the battery connections and load test the battery

The drive is supposed to come off every year for bellows, gimbal bearing and u-joint inspection along with checking alignment I would pull the drive

Pull the studs to surface the manifold

if its a moored boat, most likely there is a diving service that other boats are useing that cleans barnacles off. Buddy of mine makes a cavitation gun and pump system he sells to the navy and other outfits that uses cavitation to blow up barnacles. on a trailer queen, as stated above, load...

mcmaster carr has drill bushings available today.

pull the plugs and try turning it over. if you have water in the cylinders, you are hydro locked. if no joy, pull the drive and try. if the motor then spins over, look at your drive.

every NAPA has rubber gasket material in stock McMaster.com sells EPDM sheet cheap https://www.mcmaster.com/products/rubber-sheets/thickness~3-32/?s=epdm+rubber+rubber+sheets Cork will not hold and the die cut heat exchanger gaskets can be had from any of the heat exchanger manufacturers...

if you have a pushed out core plug, 99.9999% chance the block is cracked.

if its clanking in the lower, you need to pull the lower apart.

most likely bellows, and since its leaking, most likely need new u-joints and input shaft seal

All marine blocks using raw water cooling have rust in them However I'd you want to flush it. Mix up some oxalic acid and fill the water jacket up. Let sit for 3 days. Flush with water Repeat

With minimal maintenance that 2-stroke 40hp will outlast a 4-stroke. I would simply do the water pump maintenance and go thru the motor you have

The boat is rated for 45hp. Grew up with same boat (older ) with a 50hp Merc I would look for no less than a 40hp

None It's a distributor custom designed for the Mercruiser 470

Pull the cooling water cover and inspect the gasket surfaces

Any used motor need to have the impeller serviced prior to using the motor. Pull the lower and do a water pump service

Back flush your system. Check the impeller

Sounds like one or more bad electrical connections