1994 Dodge Shadow lower radiator hose housing at rear of bl

hi guys first let me thank you for this site, i have a 94 shadow w/ a 3.0 at the back of the block is a housing that the lower rad. hose connects to and this housing bolts to the block it is leaking at the bottom of this housing i know there is a o-ring seak in there which a friend replaced and it still leaks when the engine is running, he didnt use a factory 0-ring is the anything else in there that could be leaking? he didnt know if this intake was a wet intake or not, it seems to be leaking at the base of this housing on the bottom side,is there anything inside that could cause this to leak besdies the 0-ring? any insight would be very helpful, thanks