5.7 Hemi In 71 Dart

Why do I keep seeing “700”, “900” and “1200” dollar “wiring harnesses”?
Ouch.
Sure is expensive wiring.
Why is that?
I notice Gdemon is running a Mopar box ignition.
I’m surprised.
I figured this engine would take some kind of multiple coil set up.
No?
If I can keep the Mopar K, torsion bar front end and use Schumacher mounts that is a big plus to me.