Beefing up rear end

[mike14_07]

i am fixing to build my 496 650+hp bbc and i wanted to know what all is available and needed to handle this rear end wise that is. i know weld the tubes, can i get 5 lug 33 splines for a 1968 rear end (i have ece conversions already), what kind of lockers are made for these?, and i know a main cap support rear cover. o and this truck is mainly going to be a mean cruiser, that will be taken to the track ever so often. it is a factory 3.73 posi rear end. i will going to 4.10s. the trans is a th400 with 3500 stall and a reverse manual valvebody