PLEDGES TO ISRAEL BY U.S. QUALlFIED
Sec Kissinger has assured Israel privately, as part of new Egyptian-Israeli Sinai agreement, that US, within limits, will make every effort to be 'fully responsive' to Israel's defense, energy and econ needs; but actual language of US commitments seem less binding than Israel has sought; informant says many of key provisions of unpublished assurances and undertakings were qualified by references to need for Cong approval and limits on US resources; Kissinger illus (M)
