I have an 03 Ex Eddie Bauer 4x4, 7.3L hoss

. I'm currently running 275/70 18 tire on newer 18" King Ranch wheel with no rubbing.
I want to run the 33"x13.50 20's(MIckey Thompson Baja ATZ) that I had on my 2005 F250 6.ohhh, before I sold it.
The rear are fine, but the front rub. I trimmed the lower bumper so the only thing rubbing now is the black inner fender well. These tires are 4" wider than the 18", so I figured they'd rub.
I have D code springs(stock) on the front and G code springs(stock) on the rear. I have read lots of forums about upgrading to V's, W's, or X codes in the front, and B's in the rear from a similar year F-250.
I've read that the X's will increase the front end almost 2 3/4". While the Vs and Ws were between 1.5" to 2". Spoke to a tech at Mickey Thompson, and he said I needed 2 3/4" lift to not rub with the 33x13.50's. I'd like to try running 33 x 12.50r20's(305/55r20) with the X codes in front and B's in the back.
Can anyone out there tell me if this is going to be a success(no rubbing and a level truck) or is it going to be a trial/error thing? Pictures would be a big help with a similar rig, and if anyone has any X/B codes for sale. Thanks in advance.