It sounds like the car is in good shape, although it's hard to go on just words without detailed photos. Many people are afraid of salvaged cars but I don't have an issue as long as the frame wasn't damaged. One of my Zs was salvaged and repaired. I originally paid $2500 for the running car but it needed A LOT of work. I bought it because it was rust-free and a good platform to build on. Its alignment numbers look better than some collision-free Zs.
$6500 wouldn't even tempt me to sell my salvaged Z, unless I stripped it of a bunch of parts.