The only way to know for sure is to pull the cylinder head and measure the bore & stroke. The 216 will have a 3 1/2" bore and a 3 3/4" stroke. The 235 has a 3 9/16" bore, and a 3 15/16" stroke. A Motor magazine passenger car manual I've got here lists the 1950 216 at 92 HP, and the 235 that year at 105 HP.
Jerry


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