almost sounds to me like it could be an exhaust leak or a loose motor mount. remember to check the basics out before you do the harder and more time consuming troubleshooting

I can't hear it very well cause my laptop speakers suck, but what i can hear it sounds like a regular low rpm misfire/stumble. Take care of those vac leaks first and see where that leads you.

After almost a year of sitting what did you do to prepare the car for its first start?

Changed all the fluids and put a gas treatment in

bump...any ideas? Thinking about dropping the oilpan and checking rod bearings

Did you use threadlocker on the flywheel bolts before re-installing them?

This sounds familiar, if you have the balance shafts still in (as i did...)

http://www.youtube.com/watch?v=2jrcF294nOY

the sound sounds exactly the same as mine (thats my video....), and the balance shaft went, and if you keep doing that..as i did...youll screw up the oil pump and front case as well. Before i kept driving it ( to see if the noise would go away, or to figure out exactly what it was) it was very close to yours with the noise being more of a chatter and almost rod knock-ish, and i could tell it was robbing the car of power..ill try and find my thread to link to. That video was taken after the oil pump was screwed up so as you can see, oil was getting everywhere. (esp the belt...)

http://www.dsmtuners.com/forums/mai...-engine-possible-lifter-tick-bent-valves.html

thats what i found when i went after just the problem...and just did the bse with leaving the front in place, and this next one is what i found once i actually pulled the engine and got into it....

http://www.dsmtuners.com/forums/mai...haft-bearing-got-chewed-up-tossed-around.html

balance shafts are eliminated and yes I did put threadlocker on and torque the flywheel bots

im still gonna say its a similar sound to what my oil pump was making after this happened/before it seized. if the car sat for that long, and the pump was new(er) and wasnt primed before starting that could have caused some issues...

Do you know what BSE kit was used?