We did the Pertronix II with the Flamethrower II coil and love it. It made a big difference in how the engine fires off and runs. The Pert II has the brains to keep itself from burning up if the key is left on without the engine running. I don't know anything about the Crane. Everything I've seen says the II is more reliable than the original.
The install is every bit easy as the instructions make it sound. Make sure you either remove or bypass the pink resistor wire to the coil so you get the full voltage. You'll also need to re-time the engine when you're done.
We didn't change out the distributor cap, but did switch to low ohm plug wires, and opened up the gap on the plugs a little to take advatage of the increased fire at the plugs.
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Red '69 Coupe, 302, Weiand 8124 intake with Edelbrock 1405 on 1" spacer, Magnaflow's, Pertonix II with FlameThrower coil, fresh C-4 rebuild, factory air (need compressor), and custom red/white crushed velvet interior
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