I have a holley 3310 750 on a mopar 380 horse crate motor. The secondaries will not open. I have the quick change spring kit on the carb. I have changed the diaphragm, tried it with and without the check ball, tried all springs in the holley spring assortment. I currently have no check ball in the vacuum housing and the white spring installed. I have made sure the vacuum housing has no leaks and bench tested the secondaries by blowing air with a blow gun through the front right venturi. With the carb installed I have used the paper clip on the diaphragm rod trick to check the secondaries. I have run the car full throttle through all the gears and also just left it in drive and gradually accelerated to full throttle but the secondaries never open. Does anyone have any ideas on why the secondaries won't open? Could it be the carb is too big for the application? 67 barracuda with auto, 10 inch converter, dougs headers. 3:55 rear.