72 c-10 rears

[thumpkidd9]

i have started the frame off on my c10 and i am doing alot of planning. I want to do an ls swap and also convert the rear drums to disc. i have the stock rear currently has has a str8 6 engine but i want to make my rear positrac and disc and was wondering if there is a total rear axle that would bolt right up to my truck that i could get out the junk yard since that would be cheaper then doing all the upgrades to my own rear. Thanks