Use Toyota seal packing (aka gasket maker), the black slow setting RTV, available from Toyota or Internet.I bought my for $15. Superior oil resistance and versatility.
Sealed the semicircular rubber plug to valve cover gasket on my supra , while was applied directly to wiped surfaces.(no other sealants were able to do that.
Use long M6 screw with cut head as a guide/locating pin for the pan, then install the rest of the bolts.