Not Ranked
The World Products heads ARE a good head. The main issue I see is the dramatic increase in compression given the type of fuel available at the pump. I believe the .030 intake diameter increase is negligable, if you are moving from Iron to Aluminum the weight savings are certainly a benefit.
The only true way to be sure of the piston/valve interfearance is to "clay " it or install the heads with some light springs and a degree wheel and manually depress the valves while at overlap. Easier said than done.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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