Just for the heck to of it, here are power curve graphs for 1954 235 and 261 trucks (high-pressure engines).
Improved versions of earlier engines, and compared to engine/graph posted above.

http://chevy.oldcarmanualproject.com/chevyresto/54143.htm
http://chevy.oldcarmanualproject.com/chevyresto/54146.htm

These are available for later 235/261 engines, with higher compression heads, etc.