Unfused IGN to HEI question

[bigcarguy]

Is there already a wire going from the unfused IGN to the engine compartment? There's one on my truck so I just plugged it into the new HEI(I figured the previous owner had wired it up in anticipation of getting an HEI). When I crunk it up and drove it I noticed an extreme loss of power. THe engine just seems to have no power and it keeps backfiring and shutting off. I removed the distributor earlier today, so it might not be in the right position, but I was wondering if maybe that wire had something to do with it.