I suppose the definition of stock and the efficiency of the compressor would take effect. I always considered my 3L "stock". With a street tune and 91 octane, it was north of the 450bhp mark at 10 PSI.
My definition of stock is what it actually is, stock, and differs quite a bit from:
-Big Bore Butterflies
-Extrude Hone Intake Runners
-Gasket Matched Heads
-Stage 1 Camshafts
-High Flow Y-Pipe w/Cats
-Custom 3" exhaust
-Underdrive Pulleys
-Coolingmist water injection
Every one of those items will add power. NA that 'stock' 3.0 of yours dyno'd 214whp, or about 30bhp MORE than an actually stock 3.0. And of course, the more NA HP you have, the more boosted HP you will have. Your average stock 3.0 with 10psi will definitely NOT see 450bhp, it simply will not happen. Don't mislead the OP, of give him false hope.
I'm still on the fence about E85 as it will give big numbers. 10PSI could yeild pretty large numbers. If the car you're building is trully used as a race car only, you'd do well with E85.
The thought has crossed my mind. There is a local station with E85 at the pump.