I don't know if you need meth injection at 9lbs vs 7lbs, but if Jeremy or one of the GTO guys is telling you that I'm sure they have a good reason.

If I were buying an alky kit, I'd get one from Julio at www.alkycontrol.com Its supposedly a great kit, plus he's "local" (bradenton). I think his kits run about $450 but its all top quality stuff.