[74er]

You might want to consider opening up those lead ports. I've done so with good improvements. Maybe just do the #1 first to check it out. Once opened, squirt carb cleaner through where the fuel enters the carb near the butterfly by taking out the screw in fitting...squirt up where the fuel enters this port. Make sure you see fluid pass through all of it's passages. You may need to hold your finger over one or two passages so that you know it can travel in all directions. I melted some solder into a ball and semi-shaped it to a good plug and tapped it in to refill the lead ports. You don't want to refill the lead ports too deep or you'll block the flow. JB weld may seep into the hole and block flow before it dries.