I have his heads and cam in my '92 SC.. In fact, my SC was the prototype for his work.. Best dyno numbers were 330.5 rwhp and 402.8 rwtq with an S-model, and stock ported exhaust manifolds. This was done on a DynoJet 248c chassis dyno with standard SAE corrections.
I have more mods now, but that was the last time I dynoed it.
He uses stock size valves, Comp Cams 942 springs (good for .521 lift), and a very good 5 angle valve job.
In my opinion, the best flowing heads for the money with stock sized valves, and his ".520 special" cam is a perfect match to the flow characteristics of the heads.
Jeramie