For me in the northeast the price per dollar isn't there yet. If I want a 400 hp small block I'm better off with the magnum engine package. I have considered going big with a stroker 400B engine which in a 3400 pound Dart would be entertaining as hell.
Still have time even though I still have most of the small block parts on hand.
If I went 5.7 hemi I'd go all the way with the fuel injection and matching trans.