Old wagon Not running

1986 Cavalier Wagon 2.0
Ok, I am new here and wanna open by saying thank you to all.

My exhaust manifold blew out and heated up things under the hood. Was running fine just really loud. So I replaced my exhaust manifold, O2 sensor and Map sensor. After I was finished it wont start. I crank it, she fires up and then stalls quickly. When I try and start it again the smell of gas is very heavy and it wont fire (flooded?). If I let it sit she will do the same thing again. I have tested the Ignition switch and replaced the ECT sensor. I am not pulling any codes only a 12 of course. I am stumped I am really hoping someone could help me out. I really need my car back. I took a video and posted it on youtube to help show the issue.
http://www.youtube.com/watch?v=td9N8ts83O0
Thanks again to all.

Right about now, I would think your plugs are fouled.....

You say your exhaust blew out...be more descriptive.....did this happen because of backpressure?

The car was running, before you replaced the ex manifold? Try this....clean/replace the plugs....remove the o2 sensor from exhaust....disconnect the injector.......crank vehicle over several times to clean the cylinders......now reconnect the injector and see if it starts....if it does, let it run a few seconds and shut off....then install O2 sensor and see if it starts....if it doesn't or starts and dies, probably a blocked exhaust .....

The stock exhaust manifold were designed crappy the weld where all the pipes collect cracked and caused a heavy exhaust leak. So no I dont believe it was caused by back pressure. I have exhaust at the tail pipe so I doubt clogged exhaust I will look further into it. I will try removing the O2 sensor and changing the plugs.
Thank you.