We've had a good discusion about the power that we got out of her over on the FE forum and the general consensus is that I'm losing 20-30 HP with my PI intake.
332-428 Ford FE Engine Forum: 462 FE on the Dyno yesterday
I guess an intake designed in the 60s to work on an iron headed 428 with flat tappet is running out of steam with a 462 with ebock heads and roller cam. My power peak came at 5700rpm and even with my 1025 Demon it was still pulling over an inch of vacuum there at WOT.