When my 68 Bird was rearended in Dec. I tried to sell the car complete with engine, trans etc. A running, drivable car that took rearend damage. I offered the complete car for 10k. People told me it was only worth 3k. I pulled my engine & trans and parted the car out for just under 13k.
Combining the parts money and what the ins. co. offered for repairs, I came close to my 30k agreed upon value and to top it all off, still have motor & trans (Muncie M21 is now in my 67 LeMans and motor will be soon).
Unfortunately, the lesson I learned was that our Birds are basically worth more in parts than they are whole...