I just ordered one of the pertronix ignitors for a 200 six cylinder engine WITHOUT thermactor. I have a 1979 200 c.i. engine in my 65 Mustang coupe but don't have the thermactor system. However, after receiving the Pertronix ignitor, I noticed that the label on the box said it was for a pre-1965 six cylinder. Did I order the right one or should I have ordered the thermactor version even though I don't have the thermactor? Thanks for any assistance.