. . . The day that the manufacturers stop listing a resistance spec for plug wires, I'll stop checking them to see if they match spec.
Not trying to bust your chomps, but many modern ignition systems are designed around higher resistance secondaries.
4-7k ohms/ft is perfectly normal and by design for secondary cables in a modern GM HE ignition system.
If you go too low on the cable resistance, besides defeating their RF suppression, you can damage some ignition coils.
Again, on a HE distributorless system, with secondary wires under a foot, whether it's measuring 5kohms or 9kohms makes no meaningful difference.
I'd reserve the very low resistance ignition cables for coils designed for them.