Numbering the plug leads

Before you dismantle, wrap masking tape around each plug lead and write the cylinder number on it with a ballpoint pen.

Pull the leads off the plugs, disconnect the coil lead from the coil, unclip (or unscrew) the distributor cap and remove it with all the leads attached to it.

Replace the leads one at a time, to avoid confusion, with new leads of the right length.

Number each new plug lead as you install it.