Try to remember, the windsor V8 as used in the US was a Truck motor, never designed for performance in the context of todays engines. The mods done to it by Tickford, Herrod and the heaps of enthusiasts are considerable, particularly in the breathing dept.
The head & port work, the inlet manifold work, and the Throttle body work are not just about extra power, but HOW the power is delivered & where & how smooth, if you read the news, the new 5.6l V8 also gets a new cold air box too.
I just can't wait for the road test comparisons.
Anyway even if HRT won Bathurst, in the real world, who won the UTE race ? How good is it when a ute with leaf springs powered by a 5 litre V8 can beat a CHEV 350V8 ute with IRS over 6 laps at Bathurst ?.