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I've put the Pertronix in a few older cars. It works great. I put one on my '65 when I first got it. You'll get more power and/or better gas mileage depending on how far you push the pedal down. Duraspark works ok too (I'm running it on my '70), but I prefer the Pertronix. It's easier to install and there are fewer wires for a cleaner looking engine compartment.
I'm running a GM HEI style distributor in my truck to replace the old Dur-a-spark II which replaced a Crane XR-700 system that replaced the old point system. So far the only issues I have noticed between all the different systems is external boxes for the Dur-a-spark and XR-700. The each one performed just as well as the other but ultimately I like the GM HEI. I literally has 2 wires running to it; one for the coil power and the other is a tach signal. The XR-700 used a slotted disc under the rotor and IR light to fire the plugs. Dur-a-spark uses a magnet system like the Pertronics, so it should be just as reliable if you set the base plate correctly.
And be sure to carry a spare set of new points just in case the pertronics takes a dump....
Been there and done that Thrice......
Garbz
I've run them for years and years (well over 10) and never had a failure. Did you ever figure out why yours failed? Was it a manufacturing problem or a wiring problem?
Just finished installing the Pertronix Ignitor , Flamethower coil, and Pertronix wires. What a difference! The engine even "sounds" different. I romped on it it at about 30mph and the rear end sqwatted down and I could really feel a HP difference. Acceleration is smoother and, it starts as soon as the key is bumped. It was a very easy installation that took only a few minutes. I highly recommend this upgrade for any FE that is still running points.
Another thing I noticed aftre the upgrade is that my engine doesnt sound as strained at highway speeds like it did before. It is quieter at cruising speed. I found that interesting. I am anxious to check my fuel mileage ; )