How do I know it’s a marine part

the fuel pump easy, does it have a clear vent line attached to the pump and runs up to the carb? or a extra fitting like a 1/4-3/16 in size. The other stuff is a little harder to tell can you post any pictures. On the alternator, you shouldn't see any open areas into the stator if you do it's auto, the carb should have j-tubes on the bowl vents and some otherthings that are harder to see without taking it apart. The distributor is the hardest and you'll need to run the model number to check, put if you can find the vents on the base you have to look at the screen that's in it and see if it's a single layer or multiple layer screen, or pull the cap and if you can see daylite thru it then it's auto as well.