DACCA, Pakistan, Dec. 3— Tens of thousands of followers of East Pakistan's most popular political leader, Sheik Mujibur Rahman, staged a boisterous but peaceful procession here today as election fever mounted in anticipation of balloting Monday.

Members of the sheik's party, the Awami League, and followers of its chief rival, the Moslem League, clashed briefly in the old town, hurling brickbats and throwing punches before policemen dispersed them.

As Pakistan's first universal election approached, President Agha Mohammad Yahya Khan appealed to political leaders and the population on radio and television to remain “with in the bounds of law.”

The President also urged the voters to select candidates “de voted to the ideology and integrity of Pakistan.”

This appeared directed against Sheik Mujibur whose campaign for autonomy for East Pakistan represents the biggest challenge to the unity of the country since it was. formed in 1947 out of two Moslem areas of India 1,000 miles apart.

The sheik's program is extremely popular here, where the largely Bengali population has long felt itself discriminated against by Punjabi‐controlled West Pakistan.

Of the 300 national seats up for election, Sheik Mujibur is generally expected to win 120 to 150—all but one or two in East Pakistan, since his campaign for autonomy has not particularly endeared him to the West.

He, or anyone else who can command a majority, would then control the projected constituent assembly. According to guidelines laid down by President Yahya, that body will be charged with drafting a national charter within 120 days.

If it fails, new elections would presumably have to be called. Even if it succeeds, the guidelines, calling for maintenance of the integrity of Pakistan, may bring a presidential veto of any constitution granting too much autonomy to East Pakistan.