Sadly The Dave Clark Five's last major hit in the U.S. would be "You Got What It Takes", released in April 1967. By that time the proto-power pop and outright power pop of the British Invasion bands were giving way to psychedelia. While many British bands, among them The Beatles, adapted to the change in musical styles, The Dave Clark Five did not. The Dave Clark Five would have a few more hits in the United Kingdom and broke up in 1970.
The Dave Clark Five's historic performance of "Glad All Over" on The Ed Sullivan Show does not appear to be available online. Here then is another video of the first Dave Clark Five song most Americans on March 8 1964 ever heard.