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Also IMO there is no magic/phenomenon about these heads.
 X2. Very true, they are what they are. Nothing wrong with them, but nothing spectacular either.
I bought my heads 9 years ago, got both of them, with studs, rockers, etc NIB for 900 or so....and they still have only 45 mins or so run time on them.  No fault of the heads though.
If I was in the market for a set, they would be at the bottom of my list, right above standard Stage VIs. Biggest drawback to me is the exhaust port height. To me you have a "street" head with a raised exhaust port. Header fitment with a RB is a frickin mess. A CNC'ed Eddy will flow almost as much, without the header fitment issues. 
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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