Hi John
The Kfir was derived from the Mirage IIIC and was redesigned around the J-79 engine from the F-4. It was given an extra air intake along the spine, to cope with the demand of the new engine.Sri Lanka has used the Kfir in action agaisnt the Tamil Tigers.Other Israeli variants of Mirages were used by the Argentinians (Daggers) in the Falklands War.
regards
GttC