C.I.A FINDS OUTPUT OF IRAN OIL AT LIMIT
CIA oil analysts report that Iranian oil production will be permanently restricted to current level of 4 million bbls a day and could drop to 2.9 million bbls by '85 if nation continues to neglect its oilfields for 3 or 4 more months; say production is also threatened by Government's decisions to reduce capital investments made in oilfields; says exploration and drilling for new wells have virtually halted; Repr Les Aspin, chairman of House Intelligence Committee, comments (M)