Interesting , Awesome To Hear

By drilling them out , could you actually have cleaned them out , as in dirty or plugged ???

My 4640sa starts and idles perfect stone cold , idles cold with no choke not even touching the gas pedal , running the Mopar 284 / 484 Cam , transition off idle beyond smooth , I don't even want to try this , if not broke don't fix it ,since the many times I opened it up playing with jetting and fine tuning it

Anyways makes the Edelbrock 1407 that it replaced , man what a Headache that 1407 was , biggest POS carb I ever worked on