Arrh, I haven't read the street machine article.
I can't blame him for the small increase in power, the engine obviously wasn't even tuned up properly. Also, he isn't a expert engineer, obviously a fantastic machinist, but he doesn't have the expertise or funding to blow your socks off, not with a prototype anyway.
Its a very weird head, alloy, twin cam, twin spark, but still only 12 valves.
Personally I think he may have been on something with going DOHC, it has more of a chance of making the engine smoother than Ford VCT.
What Ford should do is quite simple, develop a 24 Valve SOHC VCT head. Maybe twin spark. And a alloy block. DI wouldn't be a bad idea either.. Increase fuel economy and power.
Yes, keep the 12 valve VCT for lower model cars, the 24 V SOHC VCT DI TS for the xr and upper models.