Old Harleys, Detroit Diesels, and stovebolts "mark their territory". Unless it's leaving puddles, chances are it's about as clean as it's going to get. Give it a good pressure wash at the local coin car wash on occasion, so the seepage can be monitored and dealt with if it starts getting out of hand. In general, "the more you run it, the less it's going to leak"- - - -especially if you're dealing with the old style rope rear oil seal. That will give you a really good excuse to get out and drive it frequently!
Jerry
