help did my timing chain skip a tooth?

[minzbitz]

84 300sd after running every test possible and couldnt solve the smoke at idle, I was tinkering with my idle screw and decided to advance the timing as far as possible. Well poor it clearrd the smoking at idle. All my Marks line up and the tang appears to be in the correct spot when the scribe markes are lined up... The only thing that bothers me about it is the awful injector nailing... I can't seem to see how it could have jumped a tooth??

Any feedback is always appreciated