Rollers can be tricky depending on your location, and who's looking at the time you're selling. My mint '01, 80K mile 6 speed roller took a while to sell with nearly no interest at $2800. I ended up trading straight across for an 04 GTO roller with slight body damage in the DFW area, and had that sold in a week for $3600. I think your price is pretty fair if the body is pretty good and the 9"/suspension component install is all professional.
My suggestion is to be open to trades, sometimes people have stuff that is a bit easier to unload/worth more, and they are looking for what you have. Just make sure to do research on any trades, and make sure the person trading is trading down while you're trading up so you for sure don't lose...that is unless they have something you want of course.
88 Thunderbird Turbo coupe soon to recieve Gen III drivetrain, 99 Trans Am (sold),97 Suzuki TL1000S, 66Chevelle Malibu)