fuel pressure dropping over time

How do you know? Have you had the gauge on it unregulated?
Now that I think about it, I don't "know"

I was referring back to an incident where it left me stranded once and when I pulled the aircleaner off it was dribbling fuel down the carb
But now that I think about it, that was after I redid the fuel system and some dirt made it past the filter and into to needle seats

Now, I do know I can adjust the pressure up to 10 PSI (and perhaps more, I haven't tried) and with this being a holley, I thought 8 was the most the floats could withstand

But no, I don't have experiential knowledge of this, since I've always had a regulator installed with this pump