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Lou.....build a 6.2

SeaRay (owned by Brunswick who also owns Mercruiser) paired BBCs with Alpha drives in 1988-1990. Then they realized their folly after replacing many drives under warranty However more importantly, a 1990 boat is 32-33 years old (2× its design life). I would be suspect of transom and stringer rot

Harbor freight predator is a honda clone

Fyi..... Based on my buds engine builder Mercs "new" 6.2 is old GM rotating assembly inside a mercruiser block casting. The crank/rods/pistons are GM bits

There are 11 beer holders shown, my guess at least 2 not shown..... You dont have enough cooler space

Yes

Just match the filters that are on there now

I would be more inclined to read the GM manual

just make sure the vent line has the proper p-trap

you have 30 days to register everything in Florida.... your boat, car, etc. hold on to your shorts when you talk to the local tax collector and find out how much the first time plate fee is.

1.6:1 for a V6, 1.5:1 for a small v8, 1.3:1 for big block

To expand on Bondos answer. The vortec heads and other changes make the 1996 and later 4.3 the one to get You would be over-reving with a 26p prop, the 19p would allow the motor to spin to 8000RPM or more when the pistons will want to go out the bottom of your boat

Its not the original trailer, tge prior owner told you any lie he needed to sell the trailer That contraption was added to a generic trailer. You can see the grape-crap welds in the back

Seloc manual has lots of wrong info. Get a proper factory manual

Have one made. Tube and fitting from the TACO Marine catalog. Just need someone with a tube bender

Check the accuracy....do not assume The dealer tech should be doing this if you paid forr diagnostic service

That contraption was added by someone smoking peyote

Yes, just pull the engine back pulling the jaws apart. You can simply loosen the set screws and slide the jaws apart on the shafts There are 2 jaws and one coupler spider

850 CFM...

My searay had a 5.0, 1.62:1 and spinning a 15x19P stainless prop While you could conceivably keep the cobra, only you can ask if its worth it