Back in the day drilling bleed holes in throttle blades was "common" to help idle with a wild cam. If you upend the carb (or just google it) there are slots that the throttle blade passes near the idle point. These are the transfer slots and help with just off idle and idle to a bit open transfer into the higher speed carb circuits. If you have to crank the idle screw too much open to get a wild cam to run, the transfer slots will be "out of" the range of the throttle blades. But nowadays many of us have wised up. Run a short VERY short distributor curve so you can run LOTS of initial timing. This helps fight that problem and allows you to close down the throttle. There are exceptions. Way too much compression ratio with certain cam profiles will generate lots of low RPM compression and you will have starter "kick" on starting........which can literally break a starter/ gear/ flywheel, and might have "ping" problems at low speed.
