suggestions for a 63 c10 rear axle rebuild

[jskeezy84]

I have a 63 c10 with a 12 bolt rear. I havent started digging into it just yet but judging from the rest of the truck I am more than certain the rear is shot. The housing looks to be good. I was thinking I could buy an 5 lug axle conversion kit and a posi trac unit and just reuse the housing to save some cash. Do they make posi trac units for the 63 12 bolts with 17 spline? or do I use a new model posi trac unit with newer axles in the 63 housing? or should I just cut my loses and switch to a 72 rear and upgrade to posi trac? My plans are an base model LS motor so the rear doesn't need to be able to handle a whole lot.