I know the intake gaskets I used when I rebuilt the motor were virtually identical to the opening in the head. If you're tearing the motor apart, you'll need the gaskets anyway. I took the lower section of the intake (where the injectors mount) off the cylinder head and was amazed that the dimensions were that close.
I didn't remove the exhaust manifolds, but that's an easy job. I'll take it apart this weekend and let you know. I want something in return though. I'll send you a PM with my request
Todd