How to properly drill carb jets?

straightlinespeed said
I bought a bunch of brass blank plugs from McMaster Carr that fit my Holley carb. Then bought a pin vise and the numbered drill bits to drill it by hand to the sizing I needed. I was able to make any arrangement of jetting I needed at the time. Might look at their site to see if they off brass blanks in that thread pattern and go that route?

The pin vise and GOOD QUALITY numbered drills is a good way to go. A good finish can be had from a drill using the right technique and good lube. I'd consider polishing the entrance and exit of the holes with some 600 grit valve compound on a toothpick or formed hardwood dowel when you are done.