When I was in the Air Force in 1978, a sergeant I worked with had a 1970 Duster 340 4 speed that he successfully campaigned with. He said he soundly whipped most comers. One day he raced a guy and while he was ahead and about 1/2 way down the track heard a lot of noise. About that time the car he was racing flew past him for the win. The opponent had a 426 Hemi that was a little doggy off the line!
I've had a lot of 340's and a 69 Hemi roadrunner. Let me tell you when you shifted that Hemi into high gear it was all over.