3/4 chassis Dart weight.

I see no reason for you not to reach the weight you want. just choose your parts wisely.

all round tubing and all chromoly. and aluminum interior to replace all removed steel floor.

aluminum racing seats

I would do all this first and weight the car with all the steel body panels first then go from there.

if your talking true carbon fiber parts you are looking at lots of dollars that could be spent elsewhere if you can make do with the factory body parts.