Not being a SA here, but sounds like you need a service manual. It will answer all the factual dimensions you need to measure, build and repair the motor. Although I am sure someone will chime in. But even then, you should have one, for future reference. Parts manual helps too.I recently acquired a 61 fl motor,the top end is off as well as the front cylinder my question is how can you tell if it has stroker or not without splitting the cases. First engine build and would appreciate the help.