......That's true. My first car (a '53 Ford Mainline) had a rebuilt Flathead V-8 that came from Sears!
If its a sears its more than likely a sun tach guts as they liked (sears) to do business with Chicago based companies for a long time .
Didn't Sears also sell Henry J's? I know they used to sell house kits; a friend of mine grew up in a house that was ordered through a Sears catalog.