http://www.ksrevenue.org/vehicle.htmThis is the site for the Kansas Department of Revenue. Scroll down to the Vehicle Registration and there is an FAQ. You may find an answer there. If not, call the County Treasurer's office and they will be able to tell you how to proceed.
I just bought a truck with some title issues and was able to get them resolved without too much problem.
Finally, when you do register it, make sure you tell them it's an antique. It will cost you a little more up front but your annual renewal should be less than $20.