Holly would stumble when stepping on the gas. Change the squirters from 28 to 32 help some change the cam gear from small light pink to white one adjusted the spring in until just touching the pivite arm now car will not stay running unless you keep your foot on the gas.Does not load up.Removed carb cleaned every thing out checked the floats find no trash in carb all passages clean no fuel restrictions Whats next!This is on a 383 small bk auto 67 camaro.What happen to my baby!

you need to adjust the acelerator pump pivot arm with it fully compressed to a .015 gap.
have a friend hold the throtle wide open (engine off!) and push down on the pump arm with a flat blade screwdriver while you set the gap. it can be done by yourself,but it's tricky.
Eric

If what Eric says doest do the trick you might step the front jets up to the next closest size. I have seen this cause the same issues when these used on engines with more cubes than a 350 modified for performance.

Steve

mechanical secondaries !!! much better performance JMHO