The orifice adapters are in your vacuum hose kit.
Two of them were in your kit.
They are brass male to female pieces with an .020" hole inside.
They will help settle down MAP signal fluctuation.
They are best installed right at the sump adapter.
Slowing down variations in the MAP pressure signal can adversely affect throttle response. This is why they are an optionally installed item.
The sump adapter has a .040" hole built in. This is present regardless of whether you use the orifice fittings.