header question

hey guys i got a 75 swinger with a 318 i got some flowtech headers im having trouble gettting the drivers side in the engine is out of the car im trying to get the headers in first then dropiing the motor in my question is does the center link go through the header i can get the header around it at all if i go under it the header is almost below the motor mount and over it the header is not even under the car please help if you have headers simular to these please post some pics of the top and bottom of the drivers side thanks a bunch im a newbie here but i look forward to posting more il get some pics up soon!