OTVC plug wires
These that are held from the valve cover bolts:

And these that are bolted to aluminum brackets from the side of the head:

The wires will have to be cut to fit. You can use MSD or Moroso for example.
I prefer the second type because you can remove your valve covers without having to worry about the spark plug wires.
Some aftermarket heads dont have the threaded holes on the sides, though.





