Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Below is a copy from official workshop manual for your engine. (Attachment Link) Shows location of special capped nuts and sealing washers to prevent oil leaks. For sealing they mean the copper type. If you're unfamiliar with copper annealing, just heat to red on a gas ring and quench in water to soften the material and they'll seal properly. Hope it helps your rebuild.