It sounds like you have an awesome and rare 67 400 4 speed. Unfortunately it's hard to put a value on it without seeing pictures of it. It sounds like it may need metal work which can add up quickly on cost, and that will impact the overall value of it. As a driver, which it sounds like this is a great one, if the paint is decent and it's a desirable color combo you may get more than market value on it because it is a rare bird and originality helps it. I sounds like it's may be under $30,000 on value based on just a guess on condition. It's possible it's worth more than $20,000 unless the metal and paint need major attention. The typical issue with our birds when they're in this window on value is collectors usually want a mint bird so they'll have to invest $20,000+ to bring it to where they want it, and the drivers market may not appreciate the originality of it and won't pay for that value in it. It's a tough spot for all involved in the transaction unless you find a buyer that has his heart set on your options and color combo. I have 3 68 400 birds and each was purchased at a different condition level, and battled all these questions myself. If you're able to share more details on options along with pictures, this group is the best for helping each other. Unfortunately I don't see many of our 400 birds selling over $40,000 even when restored to factory specs. even though you may see listings asking higher than this price. I'm sure sellers get lucky on occasion, but I know having restored a 68 bird that may have been in similar condition when compared to yours, I'm upside down on it and knew it going in, but I wanted that combo and it was worth it to me to go beyond value to have it the way I want it.