Quad carb setup information help

Thanks Rat, you know I’ve leaned very hard on you for advice getting to this point. I don’t see that changing going forward. Lol. I will make the PV change and check to see if the metering blocks are tapped or not. I’m guessing I should pin the current passages so I know the starting point size that I will drill the 8/32 plug to. A question would be how far do I drill down into the current passage. The bleeds I bought from McMaster Carr are 1/8’ long for 6 & 8/32 and 3/16 for the 10/32. I’m away this weekend so it won’t be until next week before I do the change. Thanks for everyone’s suggestions and help.
Rod