The oil pump is bolted to the front of the engine( right behind the crank pully, it has the timming marks on it) there is passage way machined in the block where it bolts on at. The holes machined into the block go through to the other side, where there is a tube (can't remember if it bolted ot welded on) that goes all the way back to the sump and that is where it gets all the oil from. Most automotive engines are designed this way. I dont think any one puts the pump in the sump, because they are usually ran off a gear from the crank or cam, so they run a tube to the oil supply or sump.
Hope this helps.
Joe
