That is correct.
Just to complicate this unnecessarily, not all high pressure engines came from the factory with 4 screw/bolt (1954-1962) valve covers.
1953 235 engines were 2-bolt and some were high pressure (Powerglide 235s, including Corvette engines), and most 1953 235s were low pressure (manual transmission car 235s and all truck 235s).
Also, if you looked at the Puget Sound link above, you saw there were three styles of 4-screw valve covers.
