The Pertronix Ignitor 1 is a good system. The Pertronix Ignitor 2 has more features, but it also has an annoying problem. When you go to start the car, the Ignitor 2 module takes a couple of seconds to warm up, so you have to leave the key in the "run" position for 2-4 seconds, otherwise the car will just crank. Some folks aren't bothered by this, but I'd rather be able to simply turn the key and start the car rather than having to remember to wait. Anyone remember the old GM diesels and the "wait" light on the dash to allow the glow plugs to warm up?
Avoid the Mallory Unilite. It can be very reliable, but can fail at any time with an errant voltage spike. They also warn that if you're doing ANY electrical work (or even spot welding), disconnect the module (or battery) or it can blow the Unilite sensor out. The Pertronics module is far more forgiving, and has proven to be extremely reliable.
Q-jet is a great choice. You can get a decent rebuild off E-bay for around $150. Avoid some of the auto parts store rebuilds. Some of those rebuilds use castings that have seen better days.
