Welcome to the site. Is the header made to clear power sterring? Some headers are not designed to clear. Most headers are a close fit to PS boxes. Alot of the time, the tube on the header that does not clear the box needs a small dimple knocked in the tube by placing a socket length-wise on the tube and hitting the socket with a hammer to create the indention to clear the box.
Also, since the header fits so close on the driver side, sometimes you have to remove the bolt on the moto mount and jack up that side of the motor to allow the header to slide in from the bottom. Make sure your car is jacked up and off the floor at least 2ft on jackstands. Once you jack the motor up on the drivers side, you should be able to see if you need to dent the header pipe. remember to measure twice before denting in this case.
69 project for my wife - SS 396, Glacier blue
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