Beginning buildup of my  '72 240Z and a F54 / P90a with triple carbs...looking at notches for injectors and choices for manifold gaskets.  I've seen lots of gaskets that follow the outline of the notches and another one that covers the notch.  Seems to me that for better airflow I should block the notch with the full circle style gasket. Recommendations?

 

Also wondering if some have welded the notches up and grind as necessary. 

 

I think your results will be indiscernible. Notched or unnotched. You should be good to go without any power loss or significant gains.