Chevcam95car

I'm getting ready to purchase the top grade kit from Combination Motorsports. I'm going with a 227-233 @ .50 .560 lift comp cam with the lifter and roller rocker setup. I'm going to have the heads milled and punched out to 200's or 202. Aslo, i'm going to have my computer tuned by Formato's Faster Proms. I'm running longtubes, cold air, stock fuel, aluminum flywheel, stock gears. What kind of idle am I going to have and what type of power increase can I expect?