Porting a slant six head

I have been reading and saving posts that I find whilst searching the slant sites, I have some questions.

I am also hoping I can get some of you more knowledgeable on the subject to chime in with opinions/observations.

I will try and keep identical threads on this site and the slant.org site as I know some of you do not visit the others sites and Id like all the opinions I can get.

Original poster asked..........'Im in the process of porting a 1980 p/u cylinder head. I was wondering what to do with the small emissions breather holes in each exhaust bowl.
Is there an epoxy that will withstand the temp. or is this mod unecessary?

Doc answered..........You can just grind down the tops of the air injection ports and then plug the main feed hole at the rear of the head. (tap it for a pipe plug or use the air tube flange and flatten / weld the tube closed) ..............

Here is a piss poor picture of that air injection hole on my own head, my camera is not the latest and greatest.

I plan to do as mentioned and grind away the top portion or the area where the casting is raised to eliminate that hump.

I am a little concerned that by doing so I will making the hole that is there larger and more pronounced.

Am I being overcautious?