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So I just rebuilt my fuel pump and someone brought it to my attention that it is not normal to have these plugs on top. Maybe my pump has been replaced at some point, like maybe an exhange program? I'm just curious, but why do you think it would be this way?

That's the vacuum half of the pump. As you can see, it's cast so that fittings can be installed on whatever side. If you really want to, you can drill and NPT tap another port. Likely the pump was originally from another car and whoever rebuilt it (or bought it pre-rebuilt) did just that, and then just plugged the originals.

These were originally just a flat boss that someone has drilled and tapped for whatever reason.

Was it like that when you sent it for rebuild? Possibly it was to remove stuck check valves but drilling like this seems overkill especially using the huge plugs rather than the small, more subtle Allen head type!

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I rebuilt the pump myself, so if it was to remove stuck valves it was sometime in the past. But as you mentioned, it sure seems like overkill.

Maybe it was rebuilt in the past and someone buggered up the top and replaced it with one that had the lines coming off the top, so they changed them to the side?

I never saw one with lines from the top but that doesn't mean they didn't exist. As humanpotatohybrid pointed out, they were designed for the lines to the front or to the rear only and I would expect if there were a top option, it would have knockouts there too.