I have a 72 Chevelle the previous owner put a 454 from a mid 70s truck in, and it's leaking out of the rear main seal area. Its a built up motor so I'm assuming it has a high volume oil pump and that's whats causing the issue. I've read to do the job you have to disconnect the trans (its a manual), and jack up the motor so its best to just pull the whole thing out. I guess my question here is, is it best just to live with it and keep an eye on your oil level? I have good oil pressure driving around town and the motor is plenty strong. Recently, I drove it Philly to Pittsburgh without issue in the drivetrain. I'd be interested in what you guys think.