I see 2930# for a 1970 /6 Duster compared to 3055# for a 1974 /6 Duster, a difference of 125#. Virtually the same difference between a 1970 Duster 340 and a 1974 Duster 360 at 120#. Before all the nitty-gritty of 4spd v automatic, undcoating (+30 lb!!) or powersteering, etc.
I would have...