yet another cam thread for stroker

Hi fellas-
I'm rebuilding my low deck 383 based 489 stroker after my rockers let go and trashed the cam. It was a good ride though- I got 10 years and 12,000 miles out of it. Of course, I want it a little faster this time around. I'd like to see 600 hp or perhaps a bit more. I would greatly appreciate any camshaft advice I can find. I'm pretty sure I'd like to stick with a solid lifter (non-roller) cam. I spoke with a guy @ Hughes and he recommended a cam with a duration of 246/250 @ .050" tappet lift and .576/.588" lift with 1.5:1 rockers. My cylinder head guy thought it was a bit conservative. What do you guys think?
A little more about the motor: 440 source heads, CNC ported. TTI 2" to 2 1/8" stepped headers. 3.55 gears. 727 trans. Carb still to be decided but I think Holley 850 or 950 with mechanical secondaries. Edelbrock performer RPM intake. I have a 9" converter from Dynamic that stalled @ 4000 rpm with my old engine (which was probably just shy of 500 hp). Converter can be changed to suit the needs of new engine. Pistons are dished giving me 9.8:1 compression. The skirts are a little scuffed so they may need replacement. I would consider buying pistons giving higher compression ratio, but this baby HAS to run on premium pump gas. I put on about 1,000 miles a year. Engine is going into a 3400 lb '71 Dart.
This is a street car, but I live out in the country with plenty of open cornfields and I regularly pound the snot out of it. Looking for an aggressive street car, nasty sounding idle, doesn't need good vacuum because I have manual brakes. I'm stealing this quote from someone on Bigblockdart.com from many years ago, but I'm looking for an "engine that scares the girls at the drive-though window."
I don't want it to kill me with maintenance though. I don't mind adjusting valves, but I don't want to be replacing valve springs every few years. So what do you think about a cam? Any suggestions about anything else that I'm planning with this engine combo are welcome. Thanks in advance!
-Jay