I’ll have to go back and look at my notes. But iirc I rotated the crank a few times to check out the positions of the crank vs. the secondary chains…once you have the crank in its TDC position you need to make sure the secondary stuff isn’t 180 degrees out.
I only took off the left (front or bank 2) valve cover so I could hold the cams still. So the torque on the bolts holding bank 1 cams (row of cylinders closest to firewall) went through the timing chains. What I mean is I held the cams on bank 2 with a wrench while removing the bank 1 cam bolts. Did the same on assembly….put bank 2 cams in, then chains, then held bank 2 cams with wrench and torqued on the bank 1 cam bolts…so torque went through the chains.
I can’t imagine removing the intake manifold and right (rear or bank1) valve cover….that looked like a days work with tools I don’t have.