Please help me diagnose engine noise (with video)

I recently built and installed a built PI 2v for my 96 GT Coupe and now I am having some noises that I am not exactly sure what it is, my first thought was piston slap, but i removed each spark plag wire 1 at a time and the noise did not change at all, so any help you guys can give would be greatly appreciated, any chance it could be the oil filter? I heard something about that possibly making noise. It almost sounds like it has a cam in it (which it doesnt), but i paid very close attention to making sure the timing was right, it drives smoothly, I havent done any WOT runs or anything until i get the sound diagnosed. It is a constant tick that never goes away except I cant seem to hear it above 2000 due to the exhaust. Its loudest near the underside of the drivers side door. Here is what I have it narrowed down to:

1 Piston Slap - Pulled each plug wire 1 at a time and the noise did not change at all. The internals were balanced by livernois motorsports and the block was prepped for the internals. (I dont think this is it)

2 Spun Bearing - Doesnt sound like other spun bearings I have heard, not really sure how to test for it, engine maybe has 45 mins to an hour of run time.

3 Oil Filter - Not sure if that could even be a reason but I think I read something about it somewhere.

4 Exhaust Leak - Again not sure how to check for it but could be a possibility

Well sorry for the long post and thanks for any help I get

video 1 http://www.youtube.com/watch?v=W4WIMOlsbLE

video 2 http://www.youtube.com/watch?v=uRC6PBHHHwQ

video 3 http://www.youtube.com/watch?v=vOOL5pIy3BY

Edit: Engine keeps throwing P1445 code which means Purge Flow Sensor Circuit High Input, Im not sure what that means.

If it was not running on all 8 cylinders, wouldnt it be throwing a misfire code?

I just bought a stethoscope and will check it in a little bit and keep you guys posted, if it is in the head what would your guess be?

Well after playing around with a stethoscope, I think I have isolated the noise to the drivers side head. The reason I say this is when I put the stethoscope on the block around where the sound is loudest I dont hear anything abnormal. Then I tried the drivers side header and the noise was alot louder there, the closer I got to the head the louder it got, although I was never able to pinpoint a location on the head, I am pretty sure that it is coming from there, now does anyone have any guesses as to what it could be? I would assume its not an exhaust leak at the header, but how would I know for sure?
It also is running extremely rich right now, with a PI engine swap is a tune required? Thats not my main concern at the moment, but I am still curious.
Any help on this is appreciated, I would like to get the engine all sorted out and running properly before winter.