Just bought a 70 600 sedan

[dedend2009]

I just bought a 1970 600 sedan. I heard this is a good place to get advice. I put some photos up from the day we bought it. we put new tires on it and got it running. It leakes oil out of the back of the engine only when it runs. Mrciless told me it is probibly bad o-rings between the clinders and the crankcase. Hope it's not to hard to take apart. Anybody done this job?