A 318 is a 318 regardless what it sits in, and it's the same engine that we had back in the '60's with some upgrades for emissions requirements. Both the 318 and the 360 topped out in OEM trim at 230HP, but the 360 gave you 325ft lbs vs 280ft lbs from the 318. Torque is what you feel in the seat of your pants, so the 360 is a better choice if you can't go Hemi - http://en.wikipedia.org/wiki/Ram_(truck)