Well lets see -- I assume we're talking about brewers corn syrup not Karo, right?
According to the Cargill website, and using rounded numbers: the syrup is 16% water, and the rest is 80% fermentable. According to tastybrew, you need about 4 ounces of sugar. Cruncing some numbers, I get 6 ounces syrup (rounded off).
That should get you close. Now you owe me a beer!
Welcome to HBT by the way.
ETA: 6 ounces by weight, not volume. Cheers!