I ran the 670 SA on a mild 383 in my Charger for years. Bought it brand new in about 2008. Car ran OK but always had a part throttle surge and slight hesitation problem. Could never get rid of either one. Car was in storage for a few years so I ordered a rebuild kit to freshen up the carb. Now it won't run at all. Put my old Eddy competition series 750 on the car and runs fine. I like Holley but I would not get another Street Avenger. Frank