You know what they say about "a bird in the hand is worth...etc"

I had a '71 Duster with a done 340 auto and a done 6pack 4spd 440 Challenger.

They both screamed but the lighter Duster, even though it was an auto, seemed to be faster. Maybe it was because you could see the front of the car twist.

But ya, the Challenger looks cooler. I'd keep the car thats done and enjoy it now. You could be dead or broke tomorrow.