Sorry, the duster I tried to take every little ounce out of while using all the stock components and it turned out lighter than my 71 scamp which has a whole bunch of "lighter" things in it. You can't say "this will only save me x amount, so I won't do it". Every little bit adds up.
As far as the heater box debate goes, they sell nice little heater blowers that plug into the cigarette lighter outlet that work great for defrosting windshield and keeping it tolerable when you take the heater box out, and are a whole lot lighter, plus they can be put in the trunk while racing. Used one for a few years now.
