When I ran mini-stocks, I used a stock Duraspark system with great success. Be sure to use a module with the blue grommet where the wires come out of it. They're color-coded for different applications and the blue grommet module is the best all-around unit to use. Doesn't matter if it comes off a 4, 6 or 8-cylinder vehicle either. And take a spare one to the track with you.