so you're saying that the one you rode in had an entirely different motor? Not a mod motor? I don't know why anyone would go to all that trouble when you can get pretty close to those numbers with an intercooled Vortech.
No it was a Powerhead built 5.0L cammer motor. 5.0L Windsor motors won't fit so well, they are too tall in the intake.
And no, you can't get those number with just a intercooler vortech. You need two things, big PSI and a built motor, you need something like 14+ psi. And even then you won't get 500+lb-ft of torque. 4.6L cammer can't handle that much boost, the pistons and the rods just aren't strong enough. At about 10psi they really start breaking things. I've seen WAY too many blocks with rods thrown right through the side as well as shattered pistons. It doesn't mean you can see one with 10psi, it means it is living on borrowed time with 10psi. The Cobra motor on the other hand is VERY, VERY tough.
Good luck
-bix