Alan: While no direct Jag experience, I have sold a bunch of them. The only cavet that has seem to come up is that you DO (as per thir instruction) HAVE to re-set timing. And I would if I was using. Ed '63 BJ-7 (Hortence THE Healey wearing STD IL plates AH BJ 7 ) '70 Camino (Amber wearing STD IL plates 7 AH BJ )