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Try hitting alignment bar a few times to see if you can center the inner gimbal bearing. Many times they get out of center as you remove heavy OD. Pray you don't have rotten stringer that sagged after you removed shaft.

yeah, TIG welding and saltwater contaminated aluminum don't play well together. I wish there was a soaking or spray solution to eliminate the salt..

Not familiar with product, but that yoke will experience a lot of RPMs and vibrations.

Now is the time to rebuild both rams/cylinders. Just me 2 cents

I have TIGed aluminum and SS. The thinner the metal the more warp. I am a do-it-yourselfer and not a professional welder like Rick. I'd go on line and see if you can find a good used one. Old Alphas were easy to find on line, but Bravos not so much.

Be sure to repaint it!!!!!!!

Edelbrock all the way with electric choke. Just be sure to buy marine and not automotive carb.

I had a similar set up on mine where it was very difficult to access by oil filter. I relocated to top on manifold using schedule 80 ss. Lot easier to see if leaking and easier to access.

I suspect corrosion is causing resistance. However, always test via a manual oil pressure system, if you have one. They are a cheap safety device for peace of mind. This will eliminate any doubt that motor oil/pump is or is not providing adequate lubrication.

I assume it still has flat surface after welding???

Indeed.

If salt boat, you may have difficulties getting it re-TIGED. You may also have corrosion on gimbal housing. Examine very closely. Y pipe may have been incorrectly torqued or just age took its toll. I am surprised boat didn't sink.

In my opinion, that was another MC design flaw. I had the same crap on an older 86. I replaced motors and these boat sinkers with SS and lots of 5200

There is more than one TC cover to fit SM Chevy. Usually, differences have to do with Timing tab(s).

Or,. you measuring tool is not accurate?

In NW Florida, most use open gaskets, since the water (Gulf, River, Bayous ) stay warm compared to other parts of the county, if they have an open cooled system. I don't know of anyone who uses restrictor gaskets, but I live on the Gulf Coast. I got away from open cooled systems. It will be a...

were riser gaskets open or closed? Motor's photo indicates that you have a sea water cooled motor and no heat exchanger.

Ouch....now don't you feel good at finding it before OD became a hand grenade?

No rust or contaminated lube? If you have time, pull and examine before next season. But, I fish way offshore and it would be a long pull ride home if it exploded while out 100 miles???

motor in video is not an antifreeze cooled engine. At least, I couldn't see any heat exchanger. If it is not a closed cooling system, the gaskets should allow sea water to pass from exhaust manifold to riser and out exhaust.