I have owned the car since 1993...paid $200.00 for it and drove it every day for a couple of years. The P600B will only make 6 pounds of boost on the 408 spinning it at max rpm. It made 10 pounds on my 360 and ran the same exact mph with 4.10 gears.

Pump Gas Small Blocks Rock! 11.53 @ 116mph E85 408 at 8500 ft da, 3605 pound truck, 3.91s, street driven