I believe that the stud for bellcranks of a 235 and a 216 are in different locations on the block. I do not know if the actual bellcranks are the same or not. I am guessing that they are not.
You can drill and tap the block for the correct location for the 216 bellcrank stud on your '58 block. You can probably do a search and find directions for that.
Carl


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission