Go on searays web site. Go to the support tab. That is all that exists in the boat side.
The motor and drive service manuals are available only from the engine manufacturer. Most likely Mercruiser. (Publications.Brunswick.com)
If you have a new flat tappet cam. Make sure to use proper break in oil (high zinc) and once started, bring to 2000 RPM for 20 minutes to break in the cam
I prefer the windiage tray over a baffle. My guess is the studs from the center caps are hitting the pan baffle. In that case, just use the baffled pan
For stuck rings, maybe usually you fill the motor with ATF. However usually the bores are trashed requiring a rebuild
However for bearings, no there is no simple fix but to pull it apart
Flat paint scratches and scuffs easy. Each scuff leaves the paint surface more shiney than the surrounding paint
It's the nature of the paint
Maybe try a flat clear