You may already know this but the two cylinder club website is a great source for information on these great tractors. I had them do a production date run for a gas 730 I had a few years ago. I purchased the tractor in SE Minnesota but it turns out it was built in 1959 and originally shipped to Texas. Membership is very reasonable and its a great resource. Also, they have a two cylinder show (called the expo) every year which has been held the past several years in Waterloo, IA (the birthplace of your 630). Supposedly the 2015 show is going to be the last as Deere is building a huge museum in Waterloo and will feature many of the older tractors. So the 2015 show should be very impressive.