Push lock vacuum lines in intake

#1
Good afternoon Buick family I’m in the middle of a new engine build and while I have the intake off I’m considering drilling and taping the back for vacuum line my question is I’ve seen a post where they used 1/16 npt to 1/4 vacuum line . Why can’t I just use straight 1/4 npt to 1/4 vacuum line and what size is the IAT senior and the vacum brake line and any info would help thanks
 
#2
Get hold of Don Cruz, he has spacers already drilled and tapped,1/2 inch and 1 inch i believe. Also think he has the fittings and lines made up. Save you some tedious work and they look great.