An easy way to cut the kernels off the cob is here. If fresh corn not available, you can substitute two 10-ounce packages of frozen corn. Of course, if you use frozen corn, you won't have cobs to put in the chowder while it simmers. That's OK. The cobs do give the chowder a deeper corn flavor, but it will still be delicious without that step.
Father Curry's version uses 2 cups of light cream instead of the whole milk + heavy cream. (The only light cream at my local grocery contained chemical additives, so I decided that I would go additive-free with milk and heavy cream. See my post on the difference between heavy cream and whipping cream.) The whole milk/heavy cream ratio is basically equivalent to light cream, also known as table cream.