The engine is a 235. It has the dist. in the middle of the block and is casting #3769716.I guess this is the question I am asking. I Thought 235's only used 2 flywheels. A 139 tooth for 6 volt starters and a 162 tooth for 12 volt starters, but this 168 tooth flywheel, casting #3705410 and it fits. What was it originally for, a 261? If so, Does it need a special matching bellhousing and starter. Thanks.