I am getting rid of the Edelbrock Performer on my '72 this week, Auto Zone says they only have a 4MV manual choke and cannot get an electric for it (??). Is this a big deal? I have the manual choke dash in my truck so it will be factory, has anyone else living at a decent altitude (4,700) had any problems or am I better off looking for an electric choke model (so far only one I could find was at Napa and was double the $$) Should this carb be good to go out of the box (other than idle mix screw adjustments), or will it need to be rejetted or anything? Also, it is a Champion rebuilt Rochester, anyone ever use one of these? Anything else I should be prepared for going back to the Qjet?