Intake crossover holes

[Sonny]

Should I tap and plug this hole under the carb? One is already plugged. I live in Florida and planning to plug the crossover ports. Seems like this hole could cause a vacuum leak if the intake gasket doesn’t seal.

 

[Badvert65]

Those are EGR ports. It looks like you have an EGR delete plate on the manifold (bottom of pic). If the plate is sealed properly, you shouldn't have a problem.

 

[steve340]

I plugged some of those with tapered pipe plugs years ago I was worried raw fuel might get in them with the engine off if the carb leaked. And on the manifold I did if the other end leaked you would get a vacuum leak.
I felt on that particular manifold if the were plugged problem avoided.
Your setup may be different however.