It seems to me he didn't get #1 cable on the right tower after dropping the dist. in at TDC. Being he turned it 1/4 turn (90*) should prove that. Must not be vacuum advance dist. or the can would hit something like the back of the intake or carb. unless there's more room on a BB than a SB.
I can't turn mine 90* on my SB in my truck.
What do you think?