This car has been on Ebay twice that I know of.
Jul '07 in Philadelphia, PA. Was advertised as a '74tii but the Seller revised this when he was advised his posted VIN 2372592 was a non-tii '76. Car reportedly sold for $6900.
Jan '10 Ebay Seller, Indianapolis, IN also advertised it as a '74tii with a starting bid of $12,000 - didn't sell.
For the car in it's current condition - '76 with tii mtr, incorrect interior, rear rockers messed with, repaint wirh overspray everywhere, etc, etc, one might expect a max of $5k. Personally I wouldn't go higher the $3.5, but that's just me.
Here's a couple pics from the Jul '07 auction.