If you just switch pumpkins, you do not have to deal with switching backing plates, (because I believe you already have bendix,) dealing with P-Brake cable, etc. You will have to deal with the proper pinion angle in either swap. The angle of the rear end pinion shaft (under normal load) should match the angle of the transmission shaft. I always question the moving of the the axle back to center it in the wheel well if you are trying to keep a stock look. Good luck,
Steve O