Oil filter adapter trouble

If i could get both hand's in there to hold the gasket in place would it be best just to take the header back off and just start over and put the adapter on then the header back on.??

I couldn't get the header in once the adapter was bolted in, I even tried leaving the adapter loose so I could turn it a bit but the header wouldn't go in once the adapter is in the way, but then again I have TTI headers. I also put on some silicon on the gasket to hold it in place.