I bought a car off George last year and wondered the same thing; as long as you have the current GA registration then no problem.
The MTO clerk (our DMV - same amount of fun) held the piece of paper like it was radioactive and shook her head. I explained the state of Georgia did not issue "titles" until the mid '80s; before that they were optional and before that none at all.
she checked, shrugged and finally handed me my new ownership and plates.
mike
Hi George