Carb tunning/mod question

Drilling the "bypass" holes in the throttle plates is a good way to get control of your idle circuits if there is not enough adjustment in the secondary stop screw. Make sure you set the secondary stop back to base and start with about a 16th" bit. I like to locate the holes over the idle fuel hole to help atomize the fuel as it comes into the manifold with a little extra turbulence. Once you are able to cover the transfer slots and get real adjustment on your idle mixture screws it will be much easier to tell the effects of the recurve on your distributor.