I’m getting ready to replace the (incorrect) 3.4 engine in my MK IX with a 3.8, recently rebuilt. I’d appreciate any advice on the proper way to attach the engine balance bar. My XK-150 has lifting bars fitted onto the head and never removed. Each one spans across the head attaching to two head bolts each, two in the front and two in the rear. Do I need them for the new engine or just attach to one of the bolts in front and one in the rear? Also, is there a concern about head bolt torque? I am used to evenly un-torquing and re-torquing head bolts – not just loosening one in the front and one in the rear to attach the balance bar. Perhaps there is a different way to do this?