1971 Duster- B5 or B3 ??

thanks...it was fully #'s matching documented car (window sticker, dealer sales order, bank payoff, etc). It def presented better in pictures, but was all there 25yr old restoration. Very happy with my current ride, a 72 Demon 340. Good luck with whatever color you chose...any thoughts on basin street blue (petty blue)?
I never really cared for Petty Blue.