My Brothers car, 408 and the weight is about the same as your Dart, but he has more gear 4.30, conv about the same, 2 weeks ago and it was hot he went 11.07, its a street car with drag radials, and iron heads.

Bryan Mopar race.jpg
1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 360/904 10.60s with J heads