Fabtech HELP!

[Screeper]

I am in the process of having my 6" lift kit installed and have hit a bit of a snag in my mechanics opinion. Once the 38X15.50 tires were mounted he noticed that the uper control arm is witin 1/2 an inch of the tire sidewall. He is talking about putting in a spacer which I hate. I am hoping for some fellow fabtech owners will check their own trucks for the clearance. I can fit my fingers between the tip of the upper control arm and the tire. If this is too close do you think there is enough material to grind down the control arm for clearance? Your opinions and experience are appreciated. My wheels are 20X10 with 0 offset. I do not know how that translates into backspacing but would assume it is 4.5 inches.

Thanks

Al