It is often feasible to return them to stock. Each case is unique so we are unable to give an estimate without seeing the frame. Very often the steering head bearings are loose in the steering head. We check all frames for this and repair as necessary. Early swingarm frames tended to crack at the swingarm pivot on the left side.
Later frames have a plate installed by the factory to strengthen the joint.
We can install this plate on early models. Swingarm frames should be shipped with the arm included. With U.P.S. the arm puts the frame in a higher weight class, so it is cheaper to send the arm separately, be sure to include the pivot bolt. K model and early Sportsters are very repairable and do not have many problems other than loose head bearings. They should be shipped with the swingarm installed.