I recall a 2 engine out TO for an SAA 747SP (possibly could have been a 741 or 742) from SID sometime in the summer of '81. The AC returned safely. Over 25 years ago, I tried a 3 engine out (actually 3 engines at idle) in a 741 sim in the cruise (I forget the altitude), with an outboard engine still operating. With the one engine at 100%, the AC could barely manage a 75 ft/min decent rate as best climb rate. We thought this gave us enough time to actually get somewhere to land.