[KingLT1]

I agree with has been previously mentioned. I would rather run a lower lift cam and give up a few HP in exchange for better reliability and longer spring life with less exotic components. Imo stock rocker arms, LS7 lifters, and dual springs don't belong in a combo with a .640 lift cam. Most of these vendors are selling cam kits that might last 20k miles before something(s) will need repaired or replaced...lifter, valve spring, valve guide.

Stock rockers and LS7 lifter combo imo should stay under .600 lift with a mild ramp lobe. Cam motion will put together a good reliable package...shoot them a call.