Dyno HP is not the same as TX mile HP.
On the Dyno the pull last less than 10 secs. At the TX mile more like 20 to 30 sec. at maximum output. Engine mods that increase HP also increase the amount of heat that has to be managed. The most important for the TX mile is the inter-cooler system. It wasn't designed for the heat output generated by faster spinning stock pulleys, or bigger Whipple blowers. The results are that the discharge air temps will rise to the point where timing must be pulled and the power drops off when compared to the dyno sheet.
One of Shadowman's customers had Gen2 Whipple I believe that did 206 at the TX mile. It was probably putting out about "only" 750HP, but because of a custom TX tune it was able to maintain that power level longer down the runway. I think that day the air density was good with a tailwind.
To summarize, when all of the stars are aligned a Whipple only car with a constant 750HP driven well can do 200+ in the mile. In less than stellar conditions one needs more HP coming down the home stretch (last 1/2 mile).
Now I am bummed, because I only have a Whipple and I would need the stars to be aligned to join the 200 club. At Mojave that is almost impossible