I hear ya man, like i said my Vette did the same thing, it had pressure at the rail but 10PSI will squirt but not fire the engine. Then once its running that 10 will work at idle but since your not on the water you cant test unload conditions.

I think a fuel pump and filter is less then a hundo, plus they are outside the tank so its easy to get to. Still even if its not the issue, not a bad part replacement for peace of mind later.