Sb/bb?
My initial opinion was go with a small block, better for daily driver use, but a big block would be pretty awesome........... I have never driven a big block Duster so I don't really know if it makes a lot of difference as far as the handling of the car feels. I have always heard that small block cars handle better....... Yeah, I still say go with a small block if nothing else because the car is already set up for it, and a stroker will give you plenty of power for the street. If you want to go racing then maybe it would be different.