It was actually super easy to do!! (Electric fans give you a ton of room up front I didn't have to move anything)
Some Were off by up to a 1/4 of an inch, now if you shim that much the actual bearing wont seat as good on the little boss. So what I did was actually tap the bearing out a bit and then shim maybe a 1/16th of an inch. The bearing was still fully engaged inside the pulley, and this gave me almost full contact on the ID of the bearing and the boss. The only ones you couldn't do this to were the bigger idler pulleys because the bearing had an actual seat to but up to, but those I didn't shim as much.
Yes I followed Batn68's writeup, thats right. The water pump pulley is EXACT Same part number 6 rib or 8 rib, I got one from Steeda.ca anyways because mine had a little groove worn in it the width of a 6 rib. If yours is good condition then it will work.
I recommend getting a straight edge or a laser alignment tool so you can align the pulleys perfect!
When you are putting on your crank pulley make SURE you seal the keyway, you WILL get oil coming by it if you don't, LOL don't ask how I know!
Now that the gears are broken in I went and did a few balls-to-the-wall runs and there is absolutely no slip, the boost is nice and consistent and holds good at high rpm shifts. So glad I did this.