If you are going to keep the stock wheels, then trimming the pitch welds is a good start. Then use self tappers to pull the liners up good and tight to the inner structure. As mentioned, you should get a bump stop system in the rear. It will protect your frame and help with compression rates back there.
Then, after all of that, I would go out and do some testing. You will see if there will need to be more trimming done. You can lightly trim the insides of the flares to increase clearance. With stock wheels, it won't be that much really. Just clean things up real good, and then go run the crap out of it. Makes inspection a little easier.
Most of us experience more damage due to the fact that we go to an aftermarket wheel that moves the tires out. That makes things a little trickier. Stay with stock wheels, and it makes it easier.
Good luck!!! Test, test, test......
