on that desktop thing are you able to put all of the cam specs and that sort of stuff
Yes. Accuracy with compression, cam timing,& accurate air flow numbers help here. Here is a recent discussion here, about it....;
http://www.forabodiesonly.com/mopar/showthread.php?t=296332&highlight=desktop+dyno
As for H.P/torque numbers... : A pocket ported 1:88/1.60 usually flows 220-230's on the intake port ,with a good three angle valve job. Ricky is dead on ,the 4000-5500 power band . peak torque: 480-500 @ 4300-4700(big cams shift torque peaks up...). Peak H.P...: Somewhere around 5300-5600 , high number roughly 410-430. A bigger set of heads,will blow you easily past the 500 zone. Just my opinion, after tweaking a 408 years ago.