Appreciate the response Dr... Little confused though. Isn't running an outboard coil and box a little redundant on a HEI? I thought that was the whole idea behind the hei, so the box and coil were part of the distributor? Maybe I'm wrong...I was just wondering (for example) if a Petronix dist would work with the MSD box ? Tired of buying MSD dist"s. They are too expensive. Thank you.