Here's a good article on taking weight off a Duster. I think the doors and bumpers etc are heavier on the later Dusters.
This is part two, I didn't find part one. Maybe someone else has it laying around.
http://www.hotrod.com/howto/113_0310_weight_reduction/index.html
There is also weight to be saved with an Aluminum radiator, heads, waterpump and housing etc
Good luck :thumrigh: