The Tomcat you're referring to is likely the Grumman F-14 Tomcat, a supersonic, twin-engine, two-seat fighter aircraft used by the United States Navy. The F-14 Tomcat had a maximum speed of approximately Mach 2.34, or about 1,544 miles per hour (2,485 kilometers per hour) at high altitudes.
However, at sea level, the top speed of the F-14 Tomcat was limited by the increased air density and drag. While I couldn't find a specific documented top speed for the F-14 Tomcat at sea level, it would likely be significantly lower than its high-altitude performance. A rough estimate for the maximum speed at sea level would be around Mach 1.2 to Mach 1.4, or approximately 800 to 930 miles per hour (1,290 to 1,497 kilometers per hour).
Keep in mind that actual performance figures may vary based on various factors such as weight, configuration, and specific conditions during the flight.