Better to ask and prevent problems
I have broken in many engines on plain old normal 10w30 over the years and haven't had any problems, but I do agree that the diesel oil is logically better. I might suggest running the diesel oil anyway... even if its run at the factory.
To hook up the tranny, you need a set of flexplate bolts (if its not already installed). I like to use red loctite on the threads. Then you need six 3/8" grade 5 or 8 bolts for to mount the tranny itself to the engine (or reuse your old ones), and you'll need some torque converter bolts (again I like to use red loctite) All of those are available at the parts store or from Summit racing.
Make sure you get the TC seated all the way in the tranny. When you install the TC should be about 1/4-1/2" away from the flexplate. If they're touching or if it prevents the tranny from mating up the engine, its not right.