1G Using these spots in 1g manifold for vac?

[GSLENK]

When I pulled the intake manifold, I noticed these plugs and the fat port attached. Any reason not to use a 3/6 bspt to -4an adapter here for say a BOV, then use the other side for the MAP?

I read somewhere that the PCV intake port is a bad idea because it is attached by little holes to each runner. Forget where I saw that. I am running a recirculated CC setup, just not with the intake manifold involved at all.

See attached photos.

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[bastarddsm]

I use those two for my box and FPR, I also welded the pcv port shut.