I am here.
Note when I did my gasket(s) I did it years ago so its a little foggy.
First are you sure that gasket set is for your motor and was the box open when you got it?
Does the other rubber part fit the front?
Could you have them switched around?
My motor was out of the truck and mounted on a stand and dont remember any issues installing it.
I get things like that at a local parts store.
Sorry I dont have any other information to pass on but it sounds like its the wrong gasket kit.
Dave ----
ps I also used the 4 part gasket as I did not know of the other type.