Is it a good idea to drill out the brass ball that goes to the needle jet on the 87 carbs, besid the pilot jet vent

My 88 has a 87 carb for some random reason, but I saw somewher that the 88-90 carbs have a hole there is this one of the mods

If so how far do I drill in, any other tips short of getting a 43b10 carb.

Bike runs great with 480 main jet