What you're installing is something a bunch of us have done. Myself on multiple builds. I suspect you're fine. But for reference, this is the bottom of that combination that was installed in my 20th Anniversary Roadster build. Two things of note: (1) There should be a small gasket between the pump inlet and the bottom of the hangar. Just visible as a black line in this picture. If missing, the pump might be pushed down more than normal. (2) Every sock I've used had the plastic ridges visible in this picture. Even if pushed against the bottom of the tank, there's still adequate passage for the fuel to enter the pump.
One other note just FYI. You referred to your tank as a "fuel cell." Confused me at first until I looked at your pictures. Yours isn't a fuel cell. That's a very specific tank made of heavier material, has a bladder, foam baffling, etc. Used in dedicated track cars and often required by certain sanctioning bodies. What you have is a standard OE Fox body Mustang fuel tank.
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