I have been toying with the idea of installing a Top Gunz Customs 8.5" long arm kit. I like this kit because of the price, however I really don't like that it has rear blocks and add-a-leafs. Does anyone know about how much the Deaver rear springs are? Also, if anyone has built thier own 8" or bigger kit, I would like to know what the cost was and which parts were used. TIA