If the Israelis can drop a nuke on the Aswan high dam Egypt suffers a flood of biblical proportions, makes the results of the dam buster raids look like a garden hose. A huge proportion of the Egyptian population including most of Cairo and much Egyptian industry is in the Nile floodplain. I find it hard to believe that the Israelis could not get a fighter bomber to with lob-toss of Damascus as well. Basically if things got to where the Arabs were looking to break in to central Israel and populated areas they would do a Samson.
Should the Arabs conquer Israel there will be a lot of nastiness. A lot of killings, a lot of rape, and serious looting. The policy at the time was that any Jews that could not trace their family back to before WWI, ie: before the British Mandate, were "illegal colonizers" and were to be expelled. Those Jews expelled from other Arab countries after 1948, either literally expelled or forced to leave by circumstance, basically left with the clothes on their back and a suitcase or two - all real estate, business, bank accounts, etc were confiscated. I expect pretty much the same would happen to the Israeli Jews in 1967.
I expect 80-90% of the Jewish population of Israel would be expelled, although to where is unclear, and they would go as paupers except for any overseas holdings. It would not be surprising if wealthy Jews who were suspected of overseas money being "encouraged" to transfer it, and a ransom paid for military POWs.