Is the sucking noise there when you turn it over? Wjere does it originate from? It sounds like the booster Vaccuum tube.
There are some bolt to undo the dash in the engine bay me thinks so you could have split disturbed the Brake Booster line then.
The starting problem sounds like a Negative Earth problem. Check that all your Electricals are workin (light, horn, heater) and have them on when you try to start it.
Just suggestions till we get more info. :-\