67 Camaro - Plugging Smog Pump holes in Exhaust Manifold

I have a question about removing the A.I.R. Pump smog tubes from the exhaust manifolds on a 1967 Camaro (originally from California). After removing the exterior plumbing, I happened to notice (when I removed
one of the exhaust manifolds) that each hole I'd be plugging, has an approx 4" tube desending into the exhaust ports on the engine
Can someone tell me if I should remove these 4" tubes when plugging these holes? And why? Shoudl I leave them so the plug has something to seal against? Or shoudl these tubes not be there if I'm going to plug their holes?
Thanks! Richard
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Wiggle the tubes out with a screwdriver. Then put pipe plugs in the holes. Save all the smog stuff. Someday you may need them.
Al
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