How much would some new valve springs cost and how do you install them and set them and also how hard is the rocker arm install?

 

I looked in to getting these too, jegs has the magnum roller tips rockers for 110.00 for the set, the crane gold race ones were around 280.00. gm performance catalog has the springs, locks and retainers for around 100.00 (don't quote me on that) i didn't ask my dealer what the price was yet. to install, will the heads be on or off the car? if it was me i would take them off and have a machine shop do a valve job on them, and install the springs while there at it, that would cost around 200.00, depending on what they have to do