Not true, at least in this case... that only applies to vehicles with a GVWR greater than the RAM 1500 (is it 8500 lb?), like the 3500 heavy duty's. Those trucks are rated at 383 hp though with the 5.7L (probably that engine is tuned for a more low-end torque).Don't forget that trucks do not have to follow the same EPA regulations as cars do so they can be tuned differently from the factory (in addition to what was mentioned above).
The INTAKE and CAM is different. They have the variable intake AND the cam is bigger. Everything else is the same. If wanted, I can put up the specs on both truck and passenger car 5.7 Hemi cams. Actually, here are the specs on the truck cam and car cam.
Chrysler doesnt seem to show what the lift and duration at 50 is. I cant find it anywhere but you can see the differance in the overlap and when the cam opens and closes the valves before and after TDC.