Car wont start after rebuild, HELP!

[OMGkiwi]

I dont think its an o2 sensor, its on the drivers side right by the coil pack.
when I checked for compression, I checked for spark while the plugs were out, spark is good and strong. I will double check the timing, but the top cover is off and the timing marks line up perfectly, ill throw a screwdriver down the #1 spark plug hole just to make sure its tdc
thanks for the help guys