The last person I remember that was in the same boat as you spent the better part of three years trying to sell their car with the same argument. (They were missing the original engine too)

Each time I saw his car advertised, the price dropped considerably. I don't know what it finally sold for, or if it even sold, but it was nowhere near what he thought.

I totally get what you are saying, and overall I agree with you. My point is ...is it worth more with a WQ block... probably, yes. But likely only a few hundred more at most over a standard YT or WZ. Nowhere near what the correct EUN would bring. I think that was also what Banshee was trying to say.

And your GTO/LeMans statements (IMHO) can get lumped in with Camaro's and their outrageous prices. They simply are more desirable cars. I still don't get that, but it sure seems to be true. So people are willing to put the blinders on for those cars.