I have done nothing to my AFC, is a spring kit a good idea. And just what exactly does it do differently than the stock springs?
The main thing that a governor sping kit (GSK) does is allow the engine to rev higher. Per say your engine will stop increasing in RPM at around 3000 (sometimes before that) a spring kit(3 gsk) will let the engine increase rpm to 3400 to 3600 a 4 gsk will go to 4400 to 4600.