The correct ignition set, usually comes with the boot pre-installed, but you should be able to take the boot and the spring end off of the old set and transfer it over.
The proper pickup coil has the ignition signal and kill wires permanently attached, and terminated, so there is no need to worry about splicing your existing kill wire.
For setting coil gap, personally I have always used the business card method, slide it between the flywheel and coil, then rotate the flywheel until the magnets pull the coil in tight, tighten down the bolts, and you should be done.