Re: 1966 Malibu 2 door
As long as it runs, drives, and stops, it should make for a great first car to start out with. I don't think the numbers-matching crowd is going to pay top dollar for this, and for that reason you aren't going to hurt the value if you modify it. You can upgrade it a little bit at a time so you can keep driving and enjoying it, or blow the whole car apart in your garage and do an all-out restomod or pro-touring type build. But to your original question, IMO since it's a 283/PG, bench seat, column-shift, and presumably 10-bolt car, it doesn't provide any of the goodies that I (or many other buyers) would be looking for. If the body and frame are all solid overall, then a car like this would make a great candidate for a build. I'd maybe pay $10k but no more than that. But that's because I'd basically be buying it to build it.
'66 SS Clone
Fast Burn 385hp Crate 350 (for now)
Muncie M20 & 3.42 Posi
UMI Stage 2 Suspension all around