Oil galley plug question

hi, originally, there was no plug in that galley. the cam plate covers it up. the later motors seem to have one installed there, if you need one get a shallow cup type cup. I don't put any in for that reason. also, early motors had 4 bolts holding the cam plate, later ones had only 3, with a tin plate to help direct oil on timing chain. just install the 4 bolts,