VANCE WILL DISCUSS GENERAL ARMS CUTS ON HIS MOSCOW TRIP
Sec Vance, in AP and UPI int, says that on his Moscow visit in Mar he will raise possibility of reductions both in USSR and US strategic weapons and in conventional arms around world; reporters are told that Carter, in his conf with Dobrynin, asked for Soviet reaction to series of hypothetical proposals for ending current deadlock on completing Vladivostok agreement, including lowering 2,400 ceiling for bombers and missiles; White House press sec Jody Powell stresses Carter commitment to Paul C Warnke as chief negotiator and Arms Control and Disarmament Agency dir despite some criticism in Sen (M)