I use to run big block Mopars back some years ago.
I've bought dual roller timming chains and never had one look like the one in
Techs web site. Mine dots usally line up, and I got them with top dead
center, advanced a couple degrees and retarded a couple degrees.
So they had tree differant settings.
If the dots didn't line up I was calling my buddy with his degreeing wheel.
Then we would check the cam to make sure it was right.
I had a cam that was not right and used a braker bar to turn the engine over
and bent a valve, good thing I didn't try to start it.
If in you think some thing is not right, degree that cam and be sure.
Kurt