Dan,
The OEM fuel pumps have a integral filter 'sock'. IIWY as long as you have the tank on your bench and its empty I'd check the internal filter and/or sediment, etc. inside the tank if you already suspect it...
After I posted that I started obsessing about it. I wanted to measure the sending unit resistance range anyway so I pulled it out and looked inside. The seals look like they will be fine to re-use so I'll pull the pump unit and check everything else out.
Any idea if Reno Radiator still does fuel tank flushes?
BTW the sending unit is pretty trashed (film at 11). I suspect the tank was run empty most of the time and the float wiper flopped up and down on the wire wound resistor core quite a bit. I'm not sure how I will address that issue.
That did inspire me to do a rigorous job with the tank prep though. It would be a royal PITA to get that thing installed, full of gas, then find a problem and have to pull it out.
In other news I think I finally drove the last nail in the filler neck ordering process. It should ship today.