Incorrect. The hot spot is for intake manifold heat. Period. It does not provide significant carb heat. If it did, the throttle plate anti-ice system made available in Canada starting in '61 and put on all North American-market slant-6s in '69, and the '70-up thermostatic air cleaner, would not have been necessary or desirable.
If this was not true, it would not have been designed into the engine from the beginning.
Well, that's a damnuisance. You can probably find and fix the problem if you will learn how the various components and systems actually work. My '73 Dart with 225 started immediately and ran damn near flawlessly all winter in Toronto. The '71 I had before the '73 behaved likewise...breaker points and all.