Even with the correct backspace (7.25" on a 10" wide wheel), you're going to get into quite a bit of work.
Mine will get down on that sized tire of 30.96", infact, it'll even get down on a 31.22" tall tire (285/50/20).
I can't tell you much about the heater core/lines or the wire harnesses because mine have all been removed, but you will need to tub the ever loving crap out of the firewall, notch and fill the frame for the tie rods, notch and fill the frame or Aarms for clearance, use spindles, possibly cut/reposition the ball joints on the Aarms (depends on what you're using), I'd go for the hydroboost brake setup..... hah, I'm running a 7" dual diaphram with a low-vac camshaft- not smart. I have tons of photos, just email at
Jody@sportruck.com .
GMC is for sale. $8500 or best offer.