hi, I remove the spring from under cross bar. let metering rods ride with the throttle. they can jump up at low vac and cause rich condition also, I set the metering rod bar to make prim jetting. my combo is .095 /.098 pri, 154 sec, 2004 rods. .775 door opening. going down the track , mine shows 12.3 to 12.4 at wide open throttle. no spikes. this is on a 340 with stock intake
these are from mopar race manual.