440 ignition question????

[built440]

I'm ready to beat my brains out right now.... I have a 1970 charger with a 440. I have a mallory electronic distribitor, and the little mallory power cell that hooks up to the coil. I receantly purchased the new mopar performance ignition box, (pretty much the msd 6al) and cannot get this thing to work... I tried one, and thought the box might be bad and got a new one sent, and just got done trying that one as well. the main problem is, when it is all hooked up the way the directions tell you, there is no spark from the coil, as soon as i disconnect the two leads from to the coil from the box, i get spark. I'm out of ideas, did any one hook this up before or anything similar, im dying for help. please

[power ram man]

the only thing i can think of is with forien cars there electrical system is ass backwards they have positive ground witch means the 'hot lead'is your ground and the negitive is your hot and american cars did it right we have negitive ground so im thinken that maby just maby the instuctions are for positive ground systems