I'm looking to replace my carb on 70 challenger 440 mag automatic. When I bought car it had a holley 800cfm double feed and pump with mechincal secondary. The carb is from the earliy 70's and I can not get the secondary to pump.I'm looking to install a new carb. Living in ohio I drive it couple times a week for maybe 5 month. No racing. It looks like most people say if you have a auto you should use a vacum secondary . Is a 800 CFM a liitle over size ? ? Would a 650 double pump and feed be to small ? Just looking for suggestions what others are using and happy with. Stock exhaust / 3.91 gears / stock tires/ edelbrock TM7 intake
thanks
Gregg