Timing chain cover PLEAZE

wusup everyone. well lets see i have to change my timing chain cover because it is cracked, so i bought one from thuls. the guy looked up the part number in the book n everything seemed fine until i compared it to the old timing chain cover. the new one has this hole on the right side of it it looks like something bolts on to it but the old one doesnt have it. besides that everything seems to line up pretty good. is this hole supposed to be there? its a pretty big hole like the size of one of the header holes n it looks as if one of the headers would bolt on it but it really wouldnt cuz its on the cover but that wat it looks like. pllease help guys
thanx

so i should just get a block off plate then. ok thanx alot. n seal it with silicone right?
thanx bro