If you value street drivability more than best ET,then a tight converter, similar to what a stock 383 roadrunner converter is, will be a good choice. The car will move out smartly when street driving without a lot of rpm, but obviusly more than a 383.
I have a 10 inch behind a 408 in a light Dart, supposed to be tight, flashes too high (4000) and feels like mush. Don't get me wrong, the car is very quick, i just don't like the loose feel. Many years ago i had a stock Hemi converter behind a 535 inch stroker, worked great for the handful of runs it survived. I think those converters were VERY similar to the 340 and 383 stock performance converters.