Here is a link to a
Tech Tip in the Stovebolt site about there being a "235" stamped in the oil pans of the pre-49 Hi-Totque engines. I've never verified that this is a reliable method. The
Master parts manual indicates that the intake ports on the 216 and early (pre 1950)235 heads are the same size. Again, I have not verified this. Check the casting numbers. I looked at an early 235 engine recently, and its casting number was "correct", according to the links on the side bar.
