I am building a stroker short block right now with the sole purpose of testing some speedmasters, edelbrock rpms and trickflow ootb heads on the dyno. While I agree it would be really interesting to see what some heads done by pbr would do the problem is they are not a widely available part to the general public. I would also like to test several other heads but time and money limit me to testing what would be the most accessible/available and likely sets of heads to be used by the average enthusiast.