how streetable do you want it? smooth idle? cammin to heck? 400 is very easy to get on any LS based motor.
I have had excellent luck with Comp, Lunati, many people also have good luck with trex, and G5's.
a 224/224 with a 116 LSA is going to have a smooth idle. a 232/240+ with a 112LSA is going to have a monster idle.
lift should be the last thing looked at. but for stock chamber I would not go over 590lift. a 560-588 would be fine. valve spring change is a must for a cam swap.
226/228 588/588 with a 112LSA would be a darn good start....or something similar to that spec. I had that in my 97 S10 with an LS1 and it loved it. topend! and in the event you do hook a kit up...it works well with it. get on LS1tech.com. and just do searchs for NA cams. dont go over kill!! there is no need for a monster cam.....