225 Slant needs a good idle. what rpms are you spinning?

I think I asked this once before, but I want to be as specific as possible here.
66 dart, slant, sedan, super six conversion , carter bbd, HEI conversion, 904 auto.

ok, so after engine is completely warmed up and driving, if I come to a stop light, remain in drive with foot on brake, my idle is about 580. Feels sorta low, but what do you guys think?

what do you guys get while in gear, at a stop, engine fully warmed.