727 push button

I would add that the market for that is pretty small, so sometimes a bird in the hand is better than two(or a flock) in the bush.

And what's 2 to 3 hours to pull it, worth to you. Since I'm 62 I'm not interested at all to pull it in my driveway; so thats at least $120Can to me. But typically, maybe $60Can. After that you would add the core value, and then a fudge-factor for the rarity and then the 413 application.If the number gets too high, you may scare the potential purchaser away.
But then he may haggle.
In the end, it's whatever you are comfortable selling at, and he is comfortable to pay for it.
Once it's sold do not think poorly of the sale. Let it go. There's a lot more to life than dollars and shoulda/couldas.
Good luck.