I am working on removing some unnecessary emissions items from my Slant 6. The engine is a 1976 in a 1972 Dart.

One of the items im doing away with is the A.I.R. system(We are Emissions exempt in this area anyway) There isnt an A.I.R. pump but what there is ,is a hose that goes into the bottom of the air cleaner which attaches to a check valve and then a metal tube that goes to the back of the cylinder head.

That metal tubing is rusted through anyway and I was wondering just what(if anything) bad might happen if I plug the passage at the back of the cylinder head. Seems all it does is pump air...Right?

A Pic is attached as reference,image is from before I got the car home.