I'm just learning about carburetors, so my knowledge on the subject is limited. To borrow a phrase from Mr. Van Zandt, "I know a little bit". About two months ago, I purchased a 1969 Chrysler 300 with the base (K) 440 and aftermarket Edelbrock 600 CFM Performer 4 barrel (which I've learned is totally wrong for the car, but that's for another time). Of course, the 300 is a HEAVY car and not necessarily built for speed, but I'm not sure if the secondaries are kicking in. Is there a way to tell? I can see the linkage move with the engine off, but the secondaries won't open because the choke is closed ("I know little") with the motor off. I saw a YouTube video of someone slowly revving up a Mustang engine and showing the secondaries open. I am hesitant to try that for fear of damaging the engine. So any suggestions would be appreciated. The carb looks brand new and is advertised as the automotive equivalent of "plug n play" so I can't imagine that there's anything wrong with it or the installation (I didn't put it on).