magnum camshaft and spring lift

i also noticed that the 94-97 360 had a longer duration than the later 360 .264 in and .274 ex nd later .269 .249 and the 5.2 is .264 nd .250ex wouldnt the duration in the earlier 360 offset the perfromance of the 5.2's lift and ive looked at some specs for the springs and valves and as far as i can tell they should be able to handle high .400 lift http://dodgeram.org/tech/gas/specs/valve-5_2.htm