340/416 vs 383 vs 440

I'm in the process of putting a 451 with tfs heads in a Duster, I went that route because of the dimensions of the B engine as opposed to RB. The cost is not much more with cutting crank and a much better variety of pistons which keeps costs down. Just My opinion but the 451 made better power than the 440 hands down. Good luck with your build.