That nut is a prick. I use a swivel on every one except that one.

By the way, the bottom of the manifold has slots instead of holes so all you need to do is loosen them a couple or three turns and then lift the intake off.

The way I get to the last bolt on the front of the motor is to stack another extension on and go after it, without a swivel, through the power steering hoses.

It will take a bit of "hunt and peck" to get onto the nut.

...Lee