Here is what I run, it makes somewhere in the low to mid 500 hp range:
360 block, 410 ci, pump gas, 10.8:1 compression
Eagle 4.00 steel crank, Scat I-beams, Diamond pistons, total seal rings (file fit),
ARP main/head studs, Edelbrock heads stage II ported by Ryan J @ Shadydell,
Small solid roller 248/254 duration w/ .576/.582 lift, Victor intake, Proform 750 dp,
4.10 gears, spool, 35 spline axles, pinion snubber, drag shocks front and rear
727, manual valve body, 8 PTC converter, 28x11.5 Hoosier QTP
3250 lbs, street trim and with 3 inch Flowmasters.
I would suggest a bigger cam than what I'm using, something in the 260° range with .600+ lift. That would get you solidly into the mid to upper 500hp range (even on pump gas).