Was Mossadegh's land reform critically different from the Shah's White Revolution?
If not, he could cause the same effects IOTL, with his National Front other than the Shah at the receiving end of all social grievances.
IOTL, the Shah gave farmland plots to the peasants, but their new small farms could not afford extensive irrigation system necessary under the climate condition of Iran, so they were out-competed by larger landlords, went broke, lost their lands, and flocked to large cities like Tehran. In the large cities, those poor and angry slum dwellers now were tempted by radical clerks, the rest was history.