Wow, really shows the worthlessness of "advertised" duration figures!
Those cams aren't too far apart in specs, yet the advertised duration numbers are 284/284 and 250/256! Sorry, got a kick outta that.
I'm not going to try to point you in one direction or another based on this data, but I sure would plug the specs into a dyno program to see what the effects are. I think that'll really help you make a decision.
__________________
1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status!
1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60'
2007 Dodge Charger SRT-8
2008 Cadillac CTS
All-American garage, baby!