chevyute,
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Search on/for: Pertronics
You'll see many people with no Pertronix problems (myself included - 6v and 12v units) and other people who have had problems (brokenhead included).
If you go Pertronix, use a coil that is recommended by Pertronix, run a ground wire from your distributor body to the head (probably does nothing, but . . .), and be careful to turn off the ignition when you stop the truck (or if the truck stalls).
There are 6v neg and 6v pos ground Pertronix units and 12v units for 216/235/261 engines.
Also, use a recommended set of ignition wires between distributor and coil/plugs.
