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There is no difference between "old" and "new" Channel 3. I would disagree about using a VCR to test out an older TV. I know it may seen hard to believe, but they still do broadcast things over-the-air! (I must be the only guy on earth without cable/dish?) In other words, just try some good old fashioned rabbit ears. You can get a set for less than $5 at K-MartWalTarget.
Unless you live waaaay out in the hills, You should get a more than enough signal quality for B&W. In urban areas, most sets will pull in some kind of lousy signal even without any antenna. The reason I'd recommend against a VCR for "testing" is because it can only complicate matters. For example, is the VCR set to use RCA outputs instead of 75 Ohm? Is there a problem with the VCR? Who knows? Best to keep it simple until you know it works.
Before you condemn the IF section; are you getting any type of sound? Even "rushing" white noise? No video at all, or just snow? If you get any of this snow/noise, the problem should lie before the IF stage, perhaps a weak tuner tube.
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