According to the standard catalog of Chrysler, 1924-1990:
A 58 Dodge Coronet 2 door sedan had a shipping weight of 3505lbs.
A 58 Plymouth Fury 2 door club sedan had a shipping weight of 3240 lbs - 3370 lbs. : A 4 door Fury sedan at 3255 lbs - 3430 lbs

The same book lists a 71 Duster with a shipping weight of 2825 lbs - 2920 lbs
A 71 340 Duster at 3140 lbs. : A 4 door Valiant at 2835 lbs - 2935 lbs

The book lists a 63 Belvedere 2 door sedan at 3000 lbs - 3215 lbs
A 2 door ht at 3025 lbs - 3190 lbs : A 4 door sedan at 3020 lbs

The book lists a 69 383 Road Runner at 3435 lbs coupe and 3450 lbs HT

Looks to me the A body weighs about the same as the 63 B body and both are a little light, but the 69 B Body's are closer in weight to the 58 cars. Gene