Not quite advice on the rebuild side. If you dremel out the small step around the throat of the carb at the bombsite level you will gain some nice hp, a slight rejet or block the crossover will be needed too
Sounds like these guys are newbs to carb rebuilding, I would NOT try any MODIFICATIONS to your carbs if you don't know what you are doing!!!!!!!!!!
My advice, take your time. Lay out everything on a CLEAN work surface and lay the parts out in order so you know how they go on/go together.
Count your screw turns (how many turns to close) for high and low speed and write it down so you can set them back to where they were.
Should be quite a few threads on here and pwctoday with step by step guides. It's not rocket science, just take your time, be patient, clean em until they sparkle with air and carb spray.