PRO FOOTBALL '74. What with the players' strike, the upstart league, basic rules changes and the promise of new dynasties rising to replace the old, this will be a season of turbulence and change. Tex Maule appraises the action ahead, while Stephen Green-Armytage's striking color photographs recall the carnival atmosphere of Super Bowl VIII. The football section concludes with NFL scouting reports and Dan Jenkins' sardonic look at all 26 coaches. The regular features and news stories include reports on Forest Hills tennis and Evel Knievel's canyonshot.