Check your fuel filter or replace it and then check your fuel pressure again. If you don't have a fuel filter take yours off and use a straight conn to check you fuel press w/o a filter. John is correct your fuel press should be about 5.5 to 6 psi.
Also, another source for Cobra floor mats is Tony Branda Shelby and Mustang parts at:
http://www.cobranda.com
Clois