i have a 71 challenger with a 383 and an automatic. i believe the rear has 3.55 gears and a suregrip. right now i'm running a carter 625 cfm carb and i've never gotten it to run right. i was thinking of getting a holley 750 double pumper but ran across a 650 over the weekend. obviously i know 650 will let it run, but i want to get some more performance out of the car. future changes are calling for a cam swap and to get the heads freshened and home ported. the engine as far as i can tell is totally stock and i would like to keep it looking that way. so there won't be any headers aluminum intakes (unless i can hid it) etc. just looking for some opinions.

thanks

jerry