hey, i own a 1980 chev with a 400 sb. it has a rochester quardrajet that needs to be replaced badly. i was just wondering what would be a good replacement carb. i can get the edelbrock avs series for dirt cheap. is it any good? how about the holley truck avenger?, or should i replace it with another quadrajet? i was gonna rebuild my carb, but the butterfly valve or whatever u wanna call it has tons of play, ive been told it cant be fixed. also im buying an edelbrock performer intake and im running headers with a K&N filter. any help on this would be greatly appreciated, thanks.