I think the Hughes dyno is a little on the happy side.I am not knocking them but some of their numbers seem optimistic to me.
I have run their heads,cams,rockers,and port matched intakes and like them a lot.
I have one of their solid cams,1.6 rockers,and port matched intakes on my 496.
If it were not for the ported heads I would have bet lower numbers.Duration=hp if you can move the air.
Try and fine a chassis dyno to tune it on and some pretty close flywheel numbers can be pulled from that.