There was a Crane in my TR6 when I purchased the car. Less than a week later it was in the trash barrel. It just did not fit and was rubbing on the rotor. To be fair, there were no instructions with it and I do not know if it even was the correct model for my car.
Like others I did, and still do, prefer points. So I installed a set of points. My troubles got worse in a hurry. At least the Crane system did not leave me stranded but the points system did several times. Having operated many kinds of equipment and cars since the 50's I had never had these kinds of problems with points systems. Condensers burning out in a few miles, caps and rotors that did not fit and often rubbed. I bought my TR6 to drive, not sit in my garage while playing roulette ordering parts to find some that work.
Now I am running a Pertronix. In more than 5,000 miles I have had no trouble of any kind with it. Comparatively, the points would have had me stranded a dozen or more times by now.
Yes, I do carry a spare points setup in my boot. The reason is that it is cheaper and hopefully would last long enough to get me home. Although past experience makes that doubtful. And from the numbers of others searching for an ignition system they can trust I am convinced that I am not the only one to have these experiences.