Agreed. And i guess one has to determine what's fast........
Saw a guy that threw a cast iron 906 head 440 in his dart, 727, 8 3/4 3.55 rear pound 10.50's all day. Single 4bbl, solid cam, 9.5 compression. What, a 1500 dollar motor roll'n 10.5's? Pretty cheap to me, and reliable.
Same day a stroked 440 (big cube motor) Duster with 4.11's couldn't get out of 11's.
A lot of times going fast is knowing what you are doing...... just say'n.....