i have been using the hei for a couple years now on both my slanted valiant and my 318 poweragon. That is the best upgrade i ever did. Hotter spark than the mopar unit, fewer components to worry about, and i can get the module everywhere. Any of the aftermarket ignitions, be it pertronics, msd, whatever, the parts are not avalible at mom and popps parts store. Even the mopar unit might not be on the shelf. The hei is. As far as thr revs, they have upgrade units that will let you rev much higher, plus in the slant that is a non-issue as the rev limit is acutaly 33% higher in a six cylinder. Since running the hei, my car, and truck, fire right up, run better, and pass smog every time. I am running a msd blaster coil with no balast resistor. Using an old computer heatsink on the truck and made a heatsink that bolts to the alt bracket for the six. Thay have lasted thru two summers here in the vegas heat. I am sold on the hei over mopar ignition
