I run a 1050 race demon RS on my 408 Indy head pump gas street strip Dart sport. I change the boosters from downleg to annular on the street which actually changes the carb to a 950. It runs really nice on the street & has exellent throttle response for a 260/266 @.50 solid roller. It has gone 9.87 at 136 with the downleg boosters in. I have not run it at the track with the annulars but I think the motor is alot smoother with them, has way better tip in & it does not give up much power.