Which SBM for the Mopar vehicle

With an overdrive transmission and the right gearing even a stock 318 could keep up with traffic in anything but the heaviest truck or C-body. That's how modern cars with 2.x 4-bangers make it work, my wife's 2013 Camry with the 2.5L engine goes 0-60 in 8 seconds thanks to having a 6-speed trans. It's when you go to pass someone at 70+ mph you feel the lack of power.