Help, need info on 833 mounting.

If it doesn't say "flywheel side", the flattest side goes to the flywheel. Lay it on the flywheel and you'll see why.
I put a tiny bit of anti-seize on every spline and a touch of hi-temp grease in the hole. Then I prefit the disc to the splines and rub the grease out; then wipe off any excess. Same with that which I put in the hole; I have a pilot I made from an 833 input I stripped off, that I stick in there, and then pull out, and wipe off anything that comes out.
That's what I do.