273 Supercharged...ITS HAPPENING PEOPLE!!
A blown 273 huh? Oughtta make about as much power as a hot N/A 360.
THIS
You have to rev the piss out of a centrifugal supercharger to make boost
5psi will not make 400whp unless it has 11:1 compression in a small block application
My stock short block 5.0 fox made 350whp/400torq with 8psi (170cc heads,70mm TB, full exhaust)
recon the stock rods, buy replacement hyper pistons, stock crank, mill the decks, port the heads or get better heads, single plane intake, good fuel system, 1 3/4" headers, 3" exhaust, and forget about the car being a sleeper.. EVERYONE will hear you coming..