Valve springs...

I have the CCA-CL20-222-3 camp, grind number CRS XE262H-10

and its telling me to get the CCA-901-16 springs.
http://store.summitracing.com/partdetail.asp?part=CCA-CL20-222-3&autoview=sku

question is, The guy befor me put the edelbrock performer stuff in, cam, springs, intake, and carb.

Do i have to purchase new retainers/ valve locks/ and shims if i go with the comp cams springs or can i re-use what i have????
thanks

Re-use what you have - but first find out how the springs you have compare to the 901s - you likely don't need to change anything. A few lbs pressure difference to what comp recommends will still work fine. Another suggestion is to remove a spring and have it pressure compared to the valve lifts of your new cam.