idle problem with long duration cam

That 305 duration cam is large for the street. Look at a line of cams with quick valve rise and shorter Advertised duration.
Look to Scoot @ Straight line Performance or around these places as well. Comp and Crane can custom grind for the same price basicly as well.
http://www.englecams.com/index.php,
http://www.cammotion.com/,
http://www.holley.com/index.asp?division=Lunati