As others have said the easiest solution is to add more ignition advance. Another fairly easy solution is to add some lash. Check with the cam mfg to see what the maximum lash is. Adding lash makes the cam seem smaller. You can also play with the cam timing but that is more involved, especially on a small block.

You'll also want to inspect the engine carefully for any vacuum leaks. Maybe plug the PCV if it is hooked up to see if that helps. Double check the AF ratio to make sure that he carb is properly adjusted. A wide band is the best way to go. If the carb is lean or rich then it can cause misfiring at idle which makes things worse.