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SU manifold have water ports but all weber and Mukunis manifolds don't have water ports.
running sidedrasfts I prefer not having the water ports in the head to worry about springing a leak.
I used 1/4 pipe plugs on my first head.
If head has the water ports already from factory I think just the short tap will work. short tap as it bottoms inside the head
Only the '75-'77 L20Bs had the U67 head without the coolant holes.ALL other L16/18 and '78 and up L20Bs had coolant passages and they didn't leak!!!!! Why plug them? because they might leak?? but history has shown that they never do.
A Weber intake that does not have coolant passages with cover any holes and the gasket will seal them. They always have.
Its a pain in the ass dealing with water getting in the intakes. I swapped many a Felpro Intake gasket as they are not as good as the SSS Graphite Nissan versions. What usually happens the lower center of the gasket blows out and gets stinky/ Pull of the sidedrtaft as a unit and replace gasket in half hour no clean up.