1965 10 bolt 3:23 posi rear end ?

I am considering selling my current rear end. It is the stock 3:23 posi rear end out of my 1965 442. It is in great condition, I just need to change my gear ratio to 3:73-4:10, and I would like to cut a rear end down to reflect 55" flg to flg. Rather than buying a new carrier, gear, disk brake kit, cut it and order new axles, I think I would come out ahead just to have a new rear end built and sell mine. Is there a market for it? what would it be worth? Any interest?

Thanks