Well, as many of you know, choosing a cam is essentially equal to doing your own taxes, and its that time for me, right now, i am running a 289 c code with an edelbrock performer intake and 600cfm edelbrock carb, with full exhaust and a LSD 8 inch with the C4 in between, and i've decided to focus on cams, when i do this, i plan to open up my exhaust ports and remove the smog humps in the process while i have the engine party in peices, the question is, what cam, my car is my daily driver, however i wouldn't mind sacraficing gas mileagle to get that distinct idle quality, what would you guys suggest as cam specifications, i was thinkin somewhere in between the 270's and 280's concerning advertised duration, if anyone could give me any advice on experience on things they have had in there cars, and things they have heard..any feedback would be greatly appreciated, thanks guys

 

As you essentially have the edelbrock performer package (less heads) go with the matching cam. (204in, 214ex @.05) which I think advertise as 270 280.
I have almost the exact same setup as you, and have a dynoed 190 HP at the wheels. (I have a street avanger 465 and tri y extractors)
For a daily driver, you will be more than impressed compared to the standard setup, and I would recommend going with 3.25 gears.
If you go with a cam with more duration, for it to give you better performance than the performer, you will need higher compression, better head flow. Without this, the cam does not deliver. You would also most likely need and a stall converter. Keeping this in mind, the performer or even performer RPM will not give you a noticeable "lumpy idle".

 

I pretty well agree with fast66.
I'd stay under .500" lift and under 210I/218E
I'd go with a 500cfm carb over a 600 also.
More is not better.