1994 Cadillac 4.6 northstar engine and I"m doing this for a friend and he needs the big recectgular gasket that s somewhere under the intake and the part # I think is something like this WP181993 any help would be apprecited. Thanks

 

Sounds like EGR spacer only found on early northstar. I believe still available from GM, you will need gaskets that go above and below it.