Cberr: It's not a 427 side oiler, no left side
oil galley, no screw-in freeze plugs, and no main bearing cross-bolts. Could be a 390 block bored & stroked to ??? cu. in.Hard telling what it is without some disassembly and measuring bore and stroke and finding some casting #'s. The "427" valve covers will fit any FE eng, 390-428.