Hey Nick,
I can't remember if I got $75 each or $75 for the pair from my 68, but likely nobody will want the drums or backing plates or want to pay the extra shipping on them. Strip them to bare spindles and you should be able to get between $100 and $200 depending on the day and whether or not it's to a friend.
My $.02,
Gene
You can buy used spindles (guaranteed good) (Mustang, Granada, Maverick) from junkyards for about $40.00 each. Backing plates are $25.00 new each, and new drums are about $30.00. Standard is that used parts are 1/2 of new. So anywhere from $125.00 - $135.00 is what someone can expect to pay at a they pull yard. At a you pull it yourself yard these parts are 1/4 that price or less. Personally with shipping charges being considered I wouldn't pay more than $85.00 + ride.