the best thing to do for starters is talk to your local DMV about it - very old farm vehicles are commonly found w/o titles, and because the numbering and registration back then was so different, they may want to just issue you a number of their own making and be done w/ it - here in BC they issue numbers based on the current year and "U-BILT", which isn't the best, but good enuff for ownership/insurance purposes - also for insurance, have lots of pics and receipts!
Bill