Welcome back, old thread. Actually, I never saw it, and now is a good time to mess with some of my wires and clean them up a bit. So, the timing was GREAT!
Is the 5.0 mustang WITH headers longer because they run the wires under the header tubes? Some are nearly 10" longer, but a couple are shorter. Can you even go under the headers on our cars, with the tight block-hugger headers?