When you can find the head and block date-casting-codes, the exact year of you engine can be ID’d

Mike, was E a suffix used for a few earlier years, also?

Here are Specifications Manuals pages for car (and truck) engine IDs.
http://www.1954advance-design.com/chev-specs/

I think that I see the E suffix from late 1957-1961 (designating slightly different equipment in some years)?

Here is 1957:
http://www.1954advance-design.com/chev-specs/1957-c-ser.pdf
Here is 1961:
http://www.1954advance-design.com/chev-specs/1961-c-ser.pdf

I am on a toy computer now - I’ll check this out and add more links in a few minutes.