Just to continue the thread that 600 hp is not the limit....
It's gone 10.60s @ 133.65 mph weighing 4200#. (I apologize - sorry - not an A-Body but a Dakota) Depending on which calculator you use, that should be in the 700hp range and it's been doing so for years.
2-bolt '99 Magnum 360 block
Factory main bolts
Scat forged crank
Scat H-Beams
Probe Forged Pistons
All internally balanced
Iron Ram EQ heads
Factory head bolts
Cometics
2bbl M1 intake
Single 76mm Turbo
18 psi of boost