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Just be careful removing the bolts from the small hole. If they fall in, you have to remove the timing cover or oil pan to retrieve them. I put a piece of blue shop towel or masking tape over the socket, then push it over the bolt to hold the socket to the bolt.

The 3 bolts can be removed through the oil fill tube. Just unbolt the tube and look in the hole and you'll see the topside of the gear. You'll have to rotate the engine to access the bolts.

Did you remove the 3 bolts holding the pump gear on?

No need to line up the marks before removal. Just don't turn the engine over after you remove the pump. I find it easier to leave the injector lines attached to the pump for removal and installation. It pulls off and on like a big spider with the lines attached.

Exhaust port for engines equipped with an EGR.

Marine injectors won't add anything by themselves. It's the pump that meters the amount of fuel delivered, not the injectors. Both the marine and the stock nozzle have the same orifice size. On the marine version the pintle has more travel allowing it to flow more fuel 'if' more fuel is supplied...