It looks like all 216, 235, and 261 engine from 1949 onwards used the dowel-end studs at both ends of the head?
It looks like the dowel-end studs were not used before 1949?

Group 3.275, part number 3835487

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.