I think the head bolt-pattern is the same on those heads and blocks BUT the side covers (push rod covers) attach differently for the two years/engines. The 1948 216 has a side cover that goes over the spark plugs and the 1953 235 has a side cover that stops at the top of the block.

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.