RUN, do not walk, away from anything Auto Zone offers. Call John Rippetoe, Jr. at Standard Motor Parts in Nashville about getting your machine work done, and call me about assembling the engine. I run the auto mechanics shop at McGavock High School in Donelson, TN. There are still enough of us around who worked on those things when they were new, that you don't have to rely on some low bid contract to get an old stovebolt back on the road reliably. There's no telling where that Auto Zone engine came from, or how well it's been assembled!
Jerry