First, place your manifold assembly on a flat surface and make sure the mating surface is true/flat from end-to-end and side-to-side. If it is not flat, you need a machine ship to true the mating surface. Then, make sure the alignment rings are not going to prevent a tight fit.
I you do not have a crows foot adapter that works with your torque wrench in those locations, use your box-end wrench from the inside towards the outside:
snug all bolts
then, snugger all bolts
then, tighten all bolts
then, real tighten all bolts
