Not a 340, but a few years ago, I remember(or seem to remember)Hot Rod Magazine putting a 340 in a 67 Dart sedan (2 door post) that was originally a 273, 4 barrel. A real shame as instead of modding the tranny crossmember for a 727, they just used a long hose clamp around the tailshaft and crossmember. Not sure how rare that would have been but just seemed like it wouldn't have been real common.
