Secondary Stumble

When u put the Holley 850 back on can u elaborate how u changed different springs and rods? AFAIK Holleys don’t use them. If u go into the secondaries slowly does it bog? Did u try his carb on ur car? It may not be the secondaries at all. Or not even the carb. Most likely fuel pressure/ volume. Check the fuel pump pushrod. It’s probably worn down(shorter) Kim