You'll get all kinds of recommendations on this one. Here's what I built in my last 454 for my A-bone sedan. It was an LS-4 that came from a Caprice station wagon. I'm not claiming that it's ideal, but it ran like a scaldedassape.

Comp Cams 292 Magnum (11-213-3) 244/244, 0.550/0.550, 110 lobe centers
Holley Street Dominator intake
Holley 850 double pumper
Mallory Unilite & super-coil
3944290 Oval port heads, no mods except a 3-angle valve job. 2.06/1.72 valves. I don't remember the CR, but it was a little over 9.0:1
Crank was stock (forged) and the rods were stock. I used Hypereutectic pistons.
4-speed top-loader w/ 4.10 gears

I'm not sure this engine was optimized, but I ran low 12's all day long on street tires and closed exhaust.

I think your heads are a little big for the street, but since you have them, I think you can develop a combo that will work.

I'd be looking at a Comp Cams Magnum Hydraulic Roller (290HR) 232/232, 0.578/0.578, 110 lobe centers, but I would confirm with Comp Cams before making the purchase. You might also check with a couple of other cam manufacturers to see what they recommend. Granted, they're trying to sell bumpsticks, but I've generally got good info from their tech lines. The dual-plane manifold is a good idea, perhaps an Edelbrock Air Gap 2 with a Speed Demon 850. . A .60-over 454 at 6000 rpm calculates out to about 800 cfm. (460 x 6000)/3456 = 799 cfm, so 850 is within the range.

Just some thoughts.