I read the directions for the heck of it and it said to use it with a MSD 6 box only. I have a MSD 6 BTM that might be bad (weather, I installed it on the firewall). If it is bad must I get a MSD 6 box in order to run it, or is it just a ploy to buy one?? I have an MSD electronic dist. too. (351W carbed).