Not sure this will help but, if we are talking about the later variants, the 707-320B or 320C, they mostly had P&W JT3D-3 engines of 18000 lb thrust. But some had the JT3D-7, of 19000 lb. IIRC, an example of that in Africa was Trek Airways, which needed as much thrust as possible for long sectors out of Johannesburg (not that the dash-7 would have delivered the full 19000 lb at 6000 ft altitude, I hasten to add).