Not even sure how long the LS bandwagon will last since GM is already phasing out LS engines in new cars for the gen 5 LTs. Some of the LS guys are already complaing that supplies of cheap junkyard LS engines are starting to dry up.
I got a set from Dick Miller Olds. He will polish them for an extra $100 or so. He also sells a set of metal plates to help with air flow. One on each side and you need two exhaust gaskets. Forgot how much I paid for them.