For me, moving the rear axle to the rear is way less work than cutting body and fenders to fit. But then body work is not my core competency while fabrication is. Yes, you need longer UCA & LCA and possibly a longer driveshaft if you don't have the room to move the engine to the rear a bit. Since I have the tools and skill I fabricated my own control arms that are far superior to the FFR originals. If you have to farm this out I don't expect that would cost all that much if you order the materials and cut the tubing to length so all the welding shop has to do is the welding. The trick is finding a welder that will do the work when you tell them what it's for (liability issue). Welders and machinists tend to not get too worried about parts for your tractor, plow, or barn doors but any critical item on a car such as suspension or steering raises a red flag...