Not to get too much off topic but stocker combinations are really about sciencing out the entire car. Crazy lightweight tricks, big dollar converters and fully rollerized transmissions, 5.xx rear gear ratios, yada yada. The engine is a big part of the equation for sure and the heads certainly make up a large percentage of what makes power but as you likely know it's he whole combo that makes those cars so impressive. Nothing streetable about them espcially with bigger oil clearances. But to your point successful S/E engine programs are borderline pro level that are put together by guys with a ton of money and/or experience or both.
Like I alluded to, the heads that 512stroker ended up with could very well have been hand-picked out of many individual castings. In my mind stocker engine builders wouldn't just pick a random set of heads and give them the full work up, they try to find particular castings that show the most potential before any real work starts.
But yeah, being able to use aftermarket aluminum heads renders that whole process moot now. All the good factory castings are probably used up or gone now anyway so the switch to aluminum could have been borne out of necessity due to a forever dwindling supply of usable OE parts.
My point being though that your average A Body forum guy using them in a weekend warrior street machine type build up might not achieve the same results employing a similar methodology with a random pair of heads that someone left laying in the dirt for 40 years. And even if they could get them to perform really well, their car still may not work as well as a competitive stocker or an well-planned off the shelf combo with better flowing aftermarket heads.
