Acceleration hits a dead wall

Yep - just installed one so that I could get a solid metric on what the fuel pressure was at. Looks to be at 3.5lbs at idle after just starting it up.
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Good call on the cam lobe wear. I have no idea how many miles are on this 225.

So my question is ... is 3.5lbs of pressure enough? I notice when I punch the throttle the pressure doesn't change (not sure if it should though)

If I was to install an electric inline pump like this one before my gauge, maybe that would be a quick low-budget test for the fuel pressure issue?
3.5 psi of fuel pressure is just enough to make it idle. Probably Not sufficient to drive normally. My opinion is that is low. And volume would be a bigger concern. If you could drive it and watch or video the gauge I bet it drops as you try to accelerate