converting an 8 3/4 to the correct sure-grip

Thanks for ithe info. I finally went into a profesional shop (Rearend specialties in San Jose, CA) today and got the straight scoop about my options. He said that the Chrysler 'Sure-Grip' was obsolete and no accompanying parts are available anywhere, though I did have the perfect 8 3/4 for my '65 Dart which has a couple of choices of the Dana or Truetrak modern replacements that would work perfectly. The whole setup rebuilt with green bearings would be about a thou without the driveshaft changeup. (from a diffeent Co.) Does this all sound reasonable?