Yesterday I noticed my LIM is leaking and took it to the guy who does all my car work, which he confirmed what i thought. He gave me an estimate of $600-$800 does this seem reasonable? He also said that everything has to come off the top of the motor including the valve covers, rockers and push rods. is this true? If he is correct and the rockers do need to come out I was thinking about having him put the 1.9 rockers in. Would I need a retune if i had him do that? and would the gains be worth it?