I just would hate to see perfect 70 grilles ground up, they will sell, It will just take time. I think your price is reasonable and I sure wish I could have bought one when I redid my 70 HemiCuda.
I can't see 71 grilles being a better seller than a sharktooth although the A-body cars are of a lower restored value than a 71 Cuda or 71 clone.

Sheldon