Stock equivalent should be fine. I had several aftermarket "high-voltage" coils die (and one killing MSD-6A box in process) on my old jeep, and ever since I've been using 12V coils (that is, coils designed to work without a ballast resistor which was a common thing in the past).
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There is a fine line between being an idiot and thinking outside the box with a touch of apathy - RobertF
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