a body rear

I'm looking for an upgrade for my 7 1/4. I have an truck 8 3/4 sure grip bbp 410 w 742 pumpkin and would be interested in a trade or purchase for an a body 8 3/4. The rear has new bearings and has been gone over . Also have interest in a 8 1/4 as long as its 3/4 posi (sure grip) let me know what you have, thanks , chris