74 Duster weight loss program

I did this on a 74 Dart sport, pretty much the same car you have. I cut out the brace that runs behind the chrome bumpers except where the "shock" bolts to the bumper and obviously to the frame. Both bumpers done was about 70 lbs. I went to manual steering. This dropped another 40 lbs, plus gave me more room under the hood, and I had one less belt to turn over! I also went to manual brakes, but the booster didn't weigh but a few pounds, however, gave me more room to change spark plugs, or replace the header gasket. These were some changes that could not be seen as the car drove by, but was about 115 lbs. I then removed the heater core assembly (figured I wasn't going to drive it in the winter anyways) and that was about 30 lbs. Then I removed the carpet, and that was about 50 lbs. I never carried a spare (they are about 40 lbs) or a jack (15 lbs). All together, about 200 lbs. and that could be felt when I was running a 318 in the car, especially off the line. I think hundred pounds is a tenth is for a big block. I believe a 318 it's just under 2 tenths. Go as extreme as you would like, but this is a start for you, and your right, it's free!