235. Here is the info:

Block Casting Number: 3764476 (used 1956-1962)
http://www.1954advance-design.com/Stovebolt-engine/casting-numbers.html

YES - Casting Date: H89 - does this mean August 8, 1959?
http://www.1954advance-design.com/chev-specs/1959-t-ser.pdf

Serial number (to left of distributor): F804A. There are no other numbers such as the production sequence number stamped here. I know the F means Flint. I thought the 804 meant August 4, 1959 but this conflicts with the casting date code. And what does type designation "A" mean? I didn't see it on the type designation list.
F804A
F = Flint, Michigan
8 = Auguat
04 = 4th

Head info:
casting number: 3836848 (used 1956-1962)
date code: A140 - January 14th 1960

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.