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01 Navigator motor- advice on exhaust manifolds/fitment


I am looking for some advice on whether or not the cobra exhaust manifolds fit and clear the firewall. I tried fitting the stock navigator PS manifold. It fits the motor and clears the frame rail. The problem is the top stud to the exhaust pipe faces right into the firewall, at a point directly under the hole for the drain for the ac. I have just looked at pictures of the cobra PS manifold, and it doesn't look like they are a whole lot different. I don't have a DS manifold yet. I don't mind modifying the PS to get it to clear, but the DS has a lot more going on and chopping the firewall may be more complicated.
It looks like several people have done a 5.4 dohc swap, so I'm hoping someone will chime in on this