Join Date: Oct 2014
Location: Nashville, Tennessee
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Just google Pontiac 389, 400 small cap HEI....you will see em MSD has one, a few other guys,..coil is external but has the module and HEI look.
Those big original size HEI are a larger diameter, so it can get difficult to stuff it in. Or put a module in a standard points distributor and use an external coil as original.
Also google the old article “Ignition performance test, ignition shootout: points vs HEI, HOT ROD Network”......
Just skip all the fluff and go to the Dino sheet at the bottom, not 2 or three HP difference in any of them,..points even better sometimes.
If you are running a street car it won’t make any difference. Now if you are a racer, that is different and you need every slight advantage, like HEI can give at sustained high rpm’s.
So you could return yours and re group to a smaller diameter, and still have a module or “ small body HEI” as MSD calls them.
Other guys supply them too.