Meh, I vote don't cut and weld the pitman arm. It isn't worth the liability alone if you ever sell it or get into an accident.
I bought a long armed XJ once from a friend. Looked sharp. Wheeled it the first time, did ok. Went to drive home... not ok. Doing 65 mph down a 7% grade between Payson and Phoenix I go to steer around the corner, so I don't go off the cliff. My steering input became a mere suggestion... lots of fun stopping and pulling over without going off the side of Mount Ord while a Peterbuilt gets bigger and bigger in the rear view. I think I inhaled the seat through my ass that day.
I get stopped and get out to see wtf is going on. Pitman cracked at a very pretty weld and bent/deflected to the side. Turns out, the previous owner's certified ASE mechanic, "certified welder", and certified dick puller cut and welded the pitman arm instead of spending another 200-300+ for the drop pitman arm that came with the RE long arm lift kit he put on the Jeep for the previous owner. If I felt like being a dick, I would have sued him into bankruptcy. Sometimes, I wish I had. No telling what other dumb chit he did to paying customers vehicles after seeing some of the dumb chit he did to that XJ.