Slant 6 Value?

I am trying to get a rough estimate on the price of a slant six with all components still attached along with the original transmission. Both parts worked great 3 years ago before it was removed from my 1968 Valiant, I just never got around to giving it to an old friend or putting it in another vehicle. When I removed the engine the vehicle had a little over 70,000 on the odometer but I have no clue if that has rolled over or not.

I am debating on selling it but not sure how much I can even get out of it. I was hoping I could get a little information from you guys about it!

Thanks,
Varment