Your post brought back memories of when gas went lead-free. My Studebaker has suffered, guess I should have driven it more often, but everything else "made the trip". But there are still some options left for my Studebaker even after all these years. I think it will be the something similar with DEF.
Now if I can find a good set of points and a distributor cap ...
And remember when they switched "back" to lead free gas we paid more for it!? My dad always drove Studebakers... until they stopped then he switched over to AMC.. ah Studebakers always ahead of everyone else! :)