Is there a difference in these two cam profiles, other than lift, duration, etc??

The biggest thing about a wet exhaust "marine cam" is the lobe separation. Typically you want to be 112*. You can get away with less, but not with a big duration cam. In a jet, you are better off running the cam a degree or two "hot" (advanced) and using a shorter duration.

Is a marine cam ground with a "different" overlap to prevent water in the "wet" headers from back flowing into the cylinders upon shut down of the motor?

Yup.

Or is the difference based upon the grinds for torque needed to get the jet going vs. a car needing a little less torque to get it moving??

Yes...    But the other way around, a jet pumps torque curve is linear, a car is not... Soo, I guess no.

It's a 460, mildly worked over factory heads, rollers rockers, .030 over, wet Basset twisty's, dual 4 tunnel ram, etc., etc.

If you have any sort of a baseline on what she does and has now, call George at Clay Smith Cams. They have quite a knowledge base on the jet boats..

A little extra money up front on a camshaft can make a big difference in the end.

If you had said Big Ole Chevy, I have quite a bit of data to back up a whole bunch of camshafts. Ford... Not so much.

GT

Don't have a baseline as the motor was barely running, and the boat wasn't water ready when I bought it, and, ironically....I'm wearing a Clay Smith Cams shirt right now, I shit you NOT,!!
I won't be racing, but I want it to perform, and sound good doing it! "Stop light to stop light" performance is fine, BUT, I want it to be able to hold its own if the time arises, if you know what I mean!?!?

It's funny, a little background.

My dad owned and operated an automotive parts store and machine shop for three decades.. We did quite a bit with CSC over the years.  My dad has Mr. Horsepower on everything. Pop up trailer, motor home, tool box, dirt bike.. I got him a Clay Smith Cams tee shirt and a travel mug for Christmas, you would have thought I gave him a Rolex.

And yes, we lead a pretty simple life.

GT

Growing up with a dad, or any family member for that matter running a parts/ machine shop would be awesome!!

Built motors at a production machine shop for years, and it sucked!! Now when I build my motors for myself, it's relaxing and "Zen like" for me!!


A SIMPLE  and drama free life is NICE!! I'll get there eventually.