I'm running a Crane ignition system in my 1970 GT6+ and it works great. I
recently moved and somehow misplaced the instruction book for adjusting the
light beam unit and will be getting in touch with Crane to get another
instruction book. Their address:
530 Fentress Blvd.
Daytona Beach, Fl.
Fax: 904 258-6167
They don't advertise an email address or web site.
I've had good luck with the system even though I have oil in the #6 cylinder.
Shortly after start up the ignition burns off the oil and it runs great. I am
working on a more permanent mounting system for the light emitter because the
factory version is a multi-link adjustable thing that looks like something
Rube Goldberg came up with. Since I won't be "taking it along to my next car"
I'll fabricate a permanent mounting bracket.
My unit is a XR7500 without the adjustable rev limiter and I bought it
through Vickie Brit. It came with several "choppers" to fit a variety of
Hope this helps.