Correct Ballast resistor

Rainy Day Auto said

So I am shopping around for an electronic ignition upgrade kit for my 71 scamp and I am noticing that some kits on the market have the bracket style ballast resistor and some have the thick style one that takes a longer bolt.

Which is more correct and which one should I get ??

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it doesn't matter what style the ballast is, all that matters is the Ohm size. I was told years ago by a Mopar mechanic for Mopar electronic ignition systems using a stock coil you should use a ballast that has 1.2 - 1.4 ohms resistance. I've allows use one in that range and have never had a problem in 30+ years with my Mopars electronic ignition systems. Here is a list of different ballast resistors I've collected over the years incase I needed one.
NAPA Echlin ICR11 (1.35 Ohms), NAPA Echlin ICR23 (1.2 Ohms), NAPA Echlin ICR34 (1.4 Ohms), Standard RU-4 (1.35 Ohms), Standard RU-23 (1.2 Ohms), Standard RU-37 (1.4 Ohms).

I always keep a spare in the glovebox so I will never be stranded on the side of the road. Even thought I only had 2 go south in all my time I've owned my Mopars. They are an electronic piece of equipment and you never know when it will stop working and I've help a few other Mopar owners over the years (that needed a ballast) with problems with their car not starting. Just my two cents worth.