If the leads are losing their insulation use silicone to 're-insulate' them. Just allow enough time for the silicone to set-up before re-installing. Or, if you're really anal you could clip the wires, slide on some shrink tubing and re-solder the wires back together.
Nick (Mr. Pockets) long ago found some spark plug boots that fit the end of the coils when his decided to stay in the spark plug wells and had to be dug out with a pick (not uncommon on any hemi-headed engine.) Even if you had to buy a set of wires to get them, that would be cheaper. My suggestion: stop by a tune-up shop and sweet talk them into selling you some, they typically make up their own wires when a single wire is damaged.
Protect boots from future damage by applying a dab of silicone grease to the boots whenever you have the coils off. This will not only keep the boots pliable, it also insulates them electrically and prevents them from sticking to the spark plug and the sides of the well. My fav:
Also available in larger bottles with a brush inside. Useful on many things, silicone grease will not cause synthetic rubber parts to deteriorate like petroleum lubricants (white grease, etc.) will.