Yes you can. I have one of theses carbs as well as the book. "Holley 4010 & 4011" by Mike Urich. This book has detailed pictures of your carb with labels showing what the different passages and restrictors are. According to this book, the idle feed restrictor is located in the booster cluster. If you remove your booster cluster and flip it upside down so that the brass emulsion tubes are pointing up, and look just a little bit further out from where the emulsion tubes emerge, you will see two brass restrictors. These are the idle feed restrictors. I must caution you though. If this is an older carb it may have either the idle air bleeds or antisiphon holes plugged. I had a booster cluster on mine that was idleing rough and I couldn't get it to tune up with the mixture adjustment screws. It tured out that one of the antisiphon holes was plugged. I could poke a piece of wire into the hole but it was plugged somewhere further inside the booster cluster which caused gas to slowly drip out of the cluster at idle. The air bleeds are similar and could also be plugged in a similar manner. I recommend you soak them in a really good solvent and blow out all the passages before you try drilling the idle feed restrictors. I hope it works out well for you.
Julian