426 Hemi or 5.7 Hemi for Duster

Easy choice for me. 426
I would go 440 before gen III
If your gonna throw money at a old car throw it into a old engine.
After all isnt it the fact that the car was old why you got the car to begin with.
I say keep it old down to the very last bolt. Sensible, probably not. Cool, forever.