RalleySnake,
I have one of these feeding the 557 in my Mercury Zephyr station wagon:
https://www.summitracing.com/parts/aei-18688
It is installed in the stock Mercury wagon tank following Aeromotive's instructions.
I run the car on the highway, in town, and also do track days at Daytona on the Rolex 24 Hour course with it. Highly recommended. Easy install as long as you have a tall enough tank, and can remove/replace the tank without too much hassle.
On the other hand, I have a drag racing type sump welded to the bottom of my Cobra's aluminum tank, about 4 or 5 inches deep and six inches or so square. It extends down at the rear of the bottom of the tank, so you can see it if you know to look for it. The pickup is under the sump, a fitting installed as a drain so to speak at the bottom of the sump; there are circular holes in baffles above the sump to further contain gasoline. I use an external Aeromotive A1000 pump located in front of the tank.
Both setups use 100 micron filters in front of the pumps, and 10 micron filters just before the injectors.
These obviously are not the only two ways of doing this job; they do seem to work. Each has run 10s of thousands of miles with only one A1000 pump failure. They each seem to work fine on the street and on the track.
Before I did the tank mod for the Cobra, it would run out of gas during a 75mph turn on the Interstate. Now it is fine!
Hope this is of some help,
Tom