I need a tech on this rear end I found

I have herd that if I can find a sure grip 7 1/4 it would be stronger and last longer with my standard trans, So I need a tech to help me on this rear and what if it needs rebuilt or is this the kind of sure grip that can not be repaired

Here is the link to the E-bay sale http://cgi.ebay.com/ebaymotors/PLYM...s=Year:1966|Model:Valiant&hash=item20b7998373

Thank you for all the help I have been getting in the past :rock: