I am about to have my 4.2 rebuilt in my 87. Is it is over 25 years old, so no emissions check, just safety inspection. I want to delete the smog box hoses and cap it at the exhaust since its missing anyway. I was wondering what I might need to keep and what else can be terminated? Also , installing the cable Axle Disconnect. Can I delete all of those old lines as well? Thanks in advance .