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I had done extensive development work around cylinder head porting and modifications, so I just did what I knew. (I even wrote a book on what I learned!)
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I've never done it, but I know that people like Jocko Johnson got fame and fortune porting heads.
Some time ago I had an engine builder build up an engine assembly based on the famous John Karcey 50-mpg Karmann Ghia.
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I read in a 1982 Popular Mechanics of a Jon Karcey who stroked a 1300 to around 1400cc, had a custom cam, dual Weber ict-34 carbs. With a few other engine mods and a freeway flyer type tranny he was getting 50+ miles per gallon from his Karmann Ghia.
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Because I wanted a truck motor, one change I made was to use big valve heads. When Hot VWs followed the same recipe, they went with fuel injection heads, apparently for smaller intake valves.
Which is the proper direction?
Per your Permalink #2, that's a thread rather than corrugations? What's a Powre Lynz?