I had to disable the vacum advance to pass. For some reason it's over advancing with the old and new distributor? I think my vacuum lines are crossed?

The Chiltons manual that I baught is weak and the library had a vacum diagram book but it wasn't all there. If someone has a factory service manual for a 76 I would appreciate a copy of all the vacum info that's in that son of a gun for the 250 and the description of the emision system!

Much appreciated!!