ITALY SEARCH FOR THE FEASIBLE IN ROME'S HANDSOME, HALF-MOON-SHAPED CHAMBER OF DEPUTIES LAST WEEK, EVERYONE HAD TO MOVE LITERALLY TO THE RIGHT TO MAKE ROOM FOR THE 166 NEWLY ELECTED COMMUNISTS, A 20 PER CENT INCREASE OVER THEIR PREVIOUS SHOWING . THE REDS PROMPTLY MADE THEIR POWER FELT IN THE BALLOTING FOR PRESIDING OFFICERS : FOR THE FIRST TIME IN HISTORY, A WOMAN, MARIA LISA RODANO, 42, WAS ELECTED CHAMBER VICE PRESIDENT . SHE IS A COMMUNIST WHO INSISTS SHE IS A ROMAN CATHOLIC AS WELL AND ATTENDS MASS ON SUNDAYS . RED BOSS PALMIRO TOGLIATTI'S COCKY DEMAND THAT COMMUNISTS BE ADMITTED TO THE GOVERNMENT WAS COLDLY REFUSED . ONLY SOLUTION . RED JUBILANCE WAS MATCHED BY CONTINUED DISSENSION IN THE CHRISTIAN DEMOCRATIC PARTY . FOCUS OF BLAME FOR THE PARTY'S 4 PER CENT DROP IN VOTES IS PREMIER AMINTORE FANFANI . HARDFISTED DEPUTY MARIO SCELBA DECLARED RED SUCCESS " IS THE FRUIT OF OUR MISTAKES AND NOT OF THE SUPERIORITY OF COMMUNIST IDEALS . " SCELBA AND OTHERS OF THE CENTER AND RIGHT STRONGLY OPPOSE A CONTINUANCE OF THE APERTURA A SINISTRA, THE SO-CALLED OPENING TO THE LEFT, INITIATED LAST YEAR BY FANFANI WHEN HE FORMED HIS ALLIANCE WITH PIETRO NENNI'S SOCIALISTS . TROUBLE IS, NO OTHER ALLIANCE SEEMS FEASIBLE . FOR THE CHRISTIAN DEMOCRATS, A COALITION WITH THE RIGHTWING MONARCHISTS AND NEO-FASCISTS IS UNTHINKABLE . " GIVEN THE PARLIAMENTARY SITUATION AND THE PREVALENT TRENDS AMONG THE PARTY, ENTED MILAN'S CORRIERE DELLA SERA, " NO SOLUTION IS POSSIBLE OTHER THAN THE SO-CALLED CENTER LEFT . " WHAT SEEMS LESS CERTAIN IS THAT PINTSIZED, PEPPERY AMINTORE FANFANI WILL SURVIVE AS PREMIER . IN ACCORDANCE WITH ITALIAN PROCEDURE, FANFANI LAST WEEK HANDED HIS RESIGNATION TO PRESIDENT ANTONIO SEGNI, WHO IS EXPECTED TO NAME A PREMIER-DESIGNATE THIS WEEK NFANI IS PASSED OVER, NO . 1 CANDIDATE FOR THE OFFICE WILL BE THE CHRISTIAN DEMOCRATS' TALL, UNASSUMING ALDO MORO, 46, WHO BECAME INTERIM PARTY LEADER IN 1959 AND HAS SINCE EMERGED AS PARTY STRONGMAN . ONLY A CARETAKER . MORO IS SAID TO BE RELUCTANT TO TAKE ON THE JOB, AND HIS LAVISH PRAISE FOR FANFANI AT THE PARTY'S NATIONAL COUNCIL MEETING LAST WEEK SUGGESTED THAT HE, FOR ONE, WOULD PRESS FOR LITTLE AMINTORE'S CONTINUANCE IN OFFICE . IN ANY CASE, HE WOULD NOT LIKELY CHANGE FANFANI'S POLICIES, SINCE HE HIMSELF WAS ONE OF THE ARCHITECTS OF THE APERTURA A SINISTRA AND FORCED PARTY ACCEPTANCE OF THE PLAN WITH A SIX-HOUR SPEECH AT LAST YEAR'S NATIONAL CONGRESS OF THE CHRISTIAN DEMOCRATS IN NAPLES . BUT MORO IS SOMEWHAT LESS ENTHUSIASTIC THAN FANFANI ABOUT ECONOMIC PLANNING, AND COULD BE EXPECTED TO BE MORE OUTSPOKEN ABOUT THE NEED TO CHECK THE COMMUNISTS . MOREOVER, HE MIGHT BE A LOT MORE POPULAR . WHERE FANFANI ENJOYS SHARP EXCHANGES AND IS QUICK TO TRADE INSULTS, MORO IS RESERVED, ANXIOUS TO AVOID ANGRY DEBATES WHENEVER POSSIBLE, AND DETESTS NAME CALLING . SAYS ONE OF HIS FRIENDS, ADMIRINGLY, " MORO RUNS THE PARTY THE WAY HE DRIVES A CAR . HE KEEPS BOTH HANDS ON THE WHEEL AND BOTH EYES ON THE ROAD, AND HE NEVER DRIVES MORE THAN 35 MILES AN HOUR . " WHETHER SEGNI CHOOSES MORO OR STICKS WITH FANFANI, THE PREMIERSHIP WILL PROBABLY BE NO MORE THAN A CARETAKER'S POSITION FOR THE NEXT TWO MONTHS . FOR NOT UNTIL MID-JULY WILL NENNI'S SOCIALISTS HOLD THEIR ANNUAL CONVENTION AND DECIDE WHETHER OR NOT TO STICK WITH THE CHRISTIAN DEMOCRATS AND KEEP THE CENTER-LEFT ALLIANCE ALIVE .