Procharger Stang...

[2000stang5.00]

Hello,
Background... i have a 2000 Mustang. It was a V6 auto. I acquired an 88 Cougar NonHO 5.0, AOD with 60K, so I swapped the V6 drivetrain for the 5.0 Cougar drivetrain, dual exhaust, harness, speed density, 50mm TB, 14LB/HR injectors, exhaust manifolds, etc. All is running great. Mid 20's MPG I found out that this nonHO 88 Cougar 5.0 is only rated at 155HP with the dual Y-pipe.
Now comes the procharger part... A few years ago I picked up a factory refurbished Nissan 350Z. Supposedly, it was putting out 500HP before it blew the bottom end out of the Nissan. No damage was done to the Procharger but the guy sent it in for a checkup to make sure. Procharger made it look like new. I havent seen the Procharger since I bought it so I cant tell you the model right now. I will have to find it. (I found the procharger. Its a C-2)
What I am think of doing is leaving the stock horsepowerchallenged long block alone and just do the bolt on stuff. Leaving the 155HP Cougar swirl port heads, cam, nonforged pistons, etc.
Im upgrading to the HO upper intake, 60mm TB, 19mm injectors, and Speed Density EEC-IV DA1.
I was thinking of adding the procharger with a lower boost pulley and see what happens. What do you guys think? Is it worth it?