Most of the cams I have seen for the Mopars tend to have more exhaust duration than intake duration....Seems to lend some truth to what your asking, at least on the exhaust side.

If I had a good set of heads on my Duster, I can tell you that thing would fly....Mine only flow 325cfm......6.12 ET last week at 112mph.....We have a set of CNC'd 325 Big EZ heads down at the shop I may decide I need to own....Although the only shop with a way to flow them closed up last year....

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk