Dunno why you need juice to get a 496 to put out 600 hp.
We ran a tired Iron 496 with Dart 355's, 14.7:1, .790+ lift Comp cam, Pro systems SV-1 induction, PG in a 2800# Camaro and ran 9.70s and never leaned on it . .
At 4900 feet MSL, 7800 ft, corrected. 116 octane Sunoco.
No Brag, just fact.
Went to a Shafirof 582, same heads, compression, a little bigger cam, same gas, ran 9.20's . . This year, we added Alky to the mix, and we're expecting 8.80's . . Still no juice . . They tend to last longer without it . .