cracks in sheet metal are fixable. Cracks in cast iron, while repairable, generally costs a great deal to do correctly. We are talking a 216 here and not the engine from a 1929 Chord. So find another 216 or go with a 235. I did have a cracked mounting boss on an oddball engine welded once. The block was stripped, the crack ground out, heated in an oven to about 500F, then a really talented welder came in and did his magic for about 3 hours. Total cost of repair was about $600.
jwhite28, welcome fellow 'bolter. We dont mind the experienced or inexperienced here. We do like pictures.