340 vin number on the oil pan rail

Trying to identify or brake down a vin # on a 1970 340 - stamped on lower oil pan rail UB291704 what car was this in? the casting # is 2780930 -340 -2 night shift 1/8/70 @3am front block stamp #FW340P31560396.Any help would be great thanks MOSSBACK .