Here is one easy solution to vacuum ports in those Intake Manifolds.  Based on 1" centers you get two 1/4 NPT and two 1/8 NPT all in one flange.  Do it all in one weld!  If thats to many ports, plug one up, better to many then not enough!   Email Sales@nubworksfabrication.com for pricing on bulk quantities. Or any other product suggestions that would make your builds easier!