Well the thing is you can run any pulley you want with whatever mods you want each car is different, I have heard of some cars that had 3-4* of KR stock and I have heard of people running a 3.4 pulley with colder plugs colder tstat and a cold air intake a crappy tune and only seeing a few degrees of KR. It all depends on your car.
The info we are giving you is so you can be safe while modding. Most of the other how to modding threads I have read followed the same format as blues does, one even suggests that if your going to mod the first thing you should buy is either a scan gauge or a tuner, a tuner being the better option of the two.