90Mustang_GT

i popped a freeze plug, and put a new one in its place from advance auto parts. its the same diameter but the wall is deeper on the new plug compared to the old plug. i got the new one in some what but it is not flush with the block. i dont want to dent it more since im using a socket on the end of a long srcrew driver and a hammer. i think i got it in as much as the old one was. with this do? i also have a leak coming from the throttle body, i think it is from the egr or spacer