360 vs 383

In my experience, a 383 2bbl and 360 2bbl are so close in every way possible that I doubt I would have known which one was in the car by just driving, without opening the hood. Especially in C-bodies. But this is just the bottom of where both power plants were intended to be..... mules.
while my experience isn't precisely apples to apples, it's fairly close.

i have a 70 D300 dually with a flat bed, 383 2bbl 727 and that thing will straight *** burn all 4 tires unloaded, set you back in your seat at a roll on from 20mph and doesn't break a sweat on the fwy at 65~70 (unloaded).

my friend has a 73 D200 long box with a 360 2bbl 727 and it feels much more under powered even though it's a considerably lighter truck. it has gobs of torque and doesn't complain when loaded or pulling a trailer, but it fully adheres to the "it'll get there, eventually" adage.