First thing I'd try is loosening the distributor and try advancing the timing. Acts like the timing is so far behind it doesn't want to run. That's a 60 second "try" that's free.
If that's not it, it seems there is either a serious vacuum leak(s) or the it's not getting fuel. i didn't watch all the videos you posted, but i didn't see you try to rev it up. If it gets smoother as the rpm's pick up, then it makes these two possibility's more suspect. I'm assuming it's not running off of 7 year old gas.....
