Is there any special fitting process?
As long as its in good condition : has good oil pressure, does not use any oil, and has no ecessive no crank case breathing while under load, then the process is quite straightforward to many standard or pre-modified engines.
How is Ignition Controlled?
Ignition control can be from the standard distributor or a mappable one.
Can the kits be swapped to different engines?
Kits can adapted as your engine is modified further or swapped to a larger or smaller engine with minor changes.