Over the years I have installed all of them on one car or another. Jacobs works really well and seems to last, Crane is good for about a year then they seem to give up either because of water or just bad electronics, Holley is good but not worth the price when you can get a MSD that seems to last forever and the biggest benefit of MSD is you never out grow it. MSD makes so many products that you can add later when you get nitrous or a turbo"supercharger" that you don't ever need to replace it just add on. Mallory is a good unit but you just don't have the additional products that you can add to it. Stay with MSD just like the pros and you will be happy with your purchase
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