It would be nice if you could get your hands on the appropriate components for the vehicle instead of using whatever you have laying around.
Have you checked the ignition advance to ensure that it's working properly? Also the ignition timing while rotating the motor by hand.
The extended crank after it's been sitting makes me want you to check fuel pressure key on engine off. And also while at idle.
The broken vacuum line that you say is on the vacuum unit, where does this route to? Depending on the production year of the vehicle there are a few differnet vacuum diagrams.