Drag Car Weights....

I run a 71 duster 2900 with 340 727 8 3/4. It has fiberglass hood front bumper. Wilwood front disc drum rear. 8 pt roll bar I run the bench seat as its easier to slide in and out with my bad back. I just added a 3 inch race exhaust to please some track rules. I also replaced the radiator with an aluminum one so now the exhaust difference is 10 pounds. Im trying to stay at 2900 lbs I like that weight and I don't want to keep changing things. If there were one more large drop in weight I could do I would. It cost money losing weight, like it does making power.