You want about 28 psi, volume should be (pick one) 29 gal/hr, 1.83 liter/min, or 0.46 liter/15 sec. Unless originality is a major issue for you my advice for replacing the pump would be to use the 5 series pump part number 16-14-1-179-232 as documented in the link below. You'll need a thin piece of rubber hose to split and wrap around it to make it the right diameter for the bracket, but other than that the replacement is straightforward. While you're at it, consider adding an electronic fuel pump cutoff, the Ford ones are cheap and work well - they can be mounted in the trunk where there is already a connector, just add a pigtail to the switch with the right ends to tie into the harness and plug it right inline.
my2002tii.com -- TII Fuel Pump Upgrade How-To
WWW.MY2002TII.COM
Be sure to track down and clean all the fuel filters! If your pressure is low look at this thread as well for how to adjust the pressure regulator valve.