.....................
Regarding the engines, as far as I have been able to ascertain,
all Chevys that rotate reverse have the cam running in the normal direction.
FYI...... in order for a REV RH Rotation engine to rotate the camshaft in the Std LH Rotation direction, it would need to be twin gear driven (one gear on crankshaft and one gear on the camshaft, and in a 2:1 ratio) in lieu of a chain/sprocket scenario.
This is a BBC twin gear driven REV RH rotation camshaft.
Note that the hypoid gear cut is the same as with a standard rotation chain/sprocket driven camshaft (second image).
Many REV RH SBC engine camshafts are chain and sprocket driven, of which allows the camshaft to rotate in the same direction as the crankshaft.
With this style camshaft, the distributor's hypoid "drive" gear is cut in a reverse fashion (as well as the "driven" gear on the distributor shaft), allowing the distributor and oil pump to rotate in the Std direction.
Some Mopars and maybe others have a reverse cam/oil pump, etc.
I am not aware of any REV RH Marine engine that would use a reverse direction oil pump. If one exists, it would be interesting to see it.