Americanmuscle.com (and Ford) say that a car with longtubes will see a 30rwhp gain from the Hot Rod Cams.
Here was my dyno sheet:
A friend of mine made 285rwhp and 297rwtq with 4.10's, an axle back, intake, and 91 tune.His intake and tune only got him 15 rwhp and 5rwtq more than me (admittedly, we feel his dyno fell short of expectations).
I know of another local guy who said his GT with full exhaust, intake, tune, under drive pulleys, hot rod cams, and charge motion delete plates made about 335 rwhp. That's a lot of money but he picked up a total of about 65rwhp (Don't know the torque).
The key in looking at the dynos with all the parts on is not necessarily what the max power is but how long it is holding a higher power level. I would rather hold 290rwtq for 3,500rpms than peak at 300rwtq for 500 rpms.
If I can get my car on the dyno this weekend, I will post up what I made with my current set up which is Mac longtubes, offroad Mac ProChamber, and Bassani axle back with 4.10 gears.