lt4 cam questions

im about to purchase a brand new gm performance parts LT4 Hot Cam. i know the idle is rough and that it will throw off the computer. does the LT4 knock module fix that problem? if yes, how much does one cost and where can i get one? also i would like to know if the lift of that cam would work with my stock heads. i have 1.6 roller rockers and i need to know if the cam has too much lift and if it will make the piston hit the valve. also i need to know if 385 fastburn valve springs will work with this cam and whether or not shims are needed. thanks

i can answer your knock module question...they are around $35, you can find them online or through a dealer

Well before u spend the money find out how much lift the heads can handle and the valve seat pressure of the springs u have. If the cam has a lot more lift than the one u have get new springs,locks,and retainers to be on the safe side.