235s from 1950 onwards had the short side cover.
3835911 was used from 1953 through 1955-1st series.
The 2-bolt 1953 head is an "oddity" in that it has a bolt pattern that matches the later blocks (does your head have 18 head bolts)?
Here are the locations of the head and block date casting codes.Maybe someone else can decode the engine serial number?
