Anyone tap the hole inside Intake to block EGR?

How did it work? Also, there is some sort of exhaust port in the bottom that threaded, leave it alone?

Jake
Worked fine, I think I also put a small freeze plug on the egr pad as well. I need to have my brother take a pic of it . It's up in prather atop of some '67 only closed chamber 318 #234 heads er whatever those numbers are. Been a minute since I was up.