I'll also hit up David at Ewillys to see if he has any info to see if it was a regional or national rebuild. As far as I knew, the Heep had never been outside of Illinois until I liberated it to the south.
As Larrbeard always says, you can never say never, or Willys never. My hunch would be that the engine probably was purchased out of a Napa or something similar. A quick Mrs. Google search brought me to an add for sale on eBay. The add is from 1961. There was another reference to Mustang Rebuilders on a 60s vintage I6 Chevy with a Mustang rebuilders tag.
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